DevNestro

Online tools

Simple Tools for Everyday Work

Count words, convert text, format JSON, and handle the small tasks that show up every day. Free to use, with no account.

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Text Tools

Case Converter

Switch text to lowercase, UPPERCASE, Title Case, Sentence case, or Capitalize Each Word.

Viewed 12 minutes ago · 1 recent view

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Privacy & Trust

Safe-to-Share File Inspector

Inspect PDF, DOCX, images, and text in your browser for PII, secrets, metadata, links, QR, and provenance before you share.

Viewed 13 minutes ago · 1 recent view

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Gemini AI Tools

AI Writer

Draft emails and articles with Gemini. Briefs are sent to Google.

Viewed 14 minutes ago · 1 recent view

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Gemini AI Tools

Structured Data Extractor

Extract JSON fields from text with Gemini. The source is sent to Google.

Viewed 16 minutes ago · 1 recent view

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Privacy & Trust

AI Image Detector

Analyze an image for AI-generation signals, provenance information, metadata and forensic indicators directly in your browser.

Viewed 18 minutes ago · 1 recent view

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PDF Tools

PDF Page Numbers

Add page numbers to a PDF in your browser with formats like Page 1 of N, custom prefix/suffix, and six positions.

Viewed 22 minutes ago · 1 recent view

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Developer Tools

JSON Formatter, Validator & Viewer

Format, validate, minify, repair, search and explore JSON directly in the browser.

Viewed 26 minutes ago · 1 recent view

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Gemini AI Tools

Gemini AI Chat

Chat with Google Gemini. Messages are sent to Google. Not processed locally.

Viewed 28 minutes ago · 1 recent view

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Online Tools

Open a tool and get to work. No account required.

Text Tools

Word Counter

Count words, characters, sentences, paragraphs, and reading time as you type.

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Text Tools

Character Counter

Track characters and words against limits for bios, SMS, and meta descriptions.

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Text Tools

Case Converter

Switch text to lowercase, UPPERCASE, Title Case, Sentence case, or Capitalize Each Word.

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Text Tools

Remove Duplicate Lines

Deduplicate lists, trim whitespace, drop blank lines, and sort the result.

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Productivity

Online Notepad

Draft text that auto-saves in this browser. Copy, download .txt, or clear.

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Calculators

Age Calculator

Find exact age in years, months, and days, plus the next birthday.

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Calculators

Percentage Calculator

Find a percent of a number, reverse percentages, increase, decrease, and difference.

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Calculators

Discount Calculator

Work out sale prices from a discount, an extra discount, and optional sales tax.

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Calculators

Savings Goal Calculator

Calculate how much you need to save regularly to reach a financial goal.

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Calculators

Zakat Calculator

Estimate Zakat on eligible assets using commonly used calculation principles.

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Business Tools

Profit Margin Calculator

Calculate profit, margin, markup and selling price for products or services.

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Calculators

Date Difference Calculator

Count years, months, days, weeks, and weekdays between two dates.

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Conversion Tools

Unit Converter

Convert length, weight, temperature, area, volume, speed, data, and time.

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Conversion Tools

File Size Converter

Convert bytes, KB, MB, GB, and TB using decimal (1000) or binary (1024) units.

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Conversion Tools

Currency Converter

Convert currencies with recent Frankfurter reference exchange rates, swap, and history.

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File Tools

File Share

Share files up to 16 GB with a secure link that automatically expires after 24 hours.

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Productivity

Online Screen Recorder

Record your screen, tab, or window with optional microphone and webcam. Download locally or share for 24 hours.

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Productivity

Script to Video Maker

Turn a script into a captioned video with local Auto Voice, an uploaded voice-over, or captions only.

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Productivity

AI Book Marketing Video Generator

Create book trailers, BookTok clips, and launch teasers from your cover and blurb. Standard composer works without Veo.

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Audio Tools

Text to Speech

Convert text or documents into natural speech using multiple voices directly in your browser.

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Audio Tools

Video & Audio Text Extractor

Extract spoken words and on-screen text from video or audio in your browser. Download TXT, SRT, and VTT.

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Document Tools

OCR

Extract editable text from images, screenshots and scanned PDFs directly in your browser.

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Developer Tools

Universal Data Converter

Convert structured data between JSON, CSV, XML and YAML.

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Data Tools

CSV / Excel Data Cleaner

Clean CSV and Excel files by removing duplicates, empty rows, whitespace and inconsistent values.

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Developer Tools

Text & File Diff Checker

Compare text, code or files and clearly see what changed.

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Developer Tools

URL Toolkit

Parse, build, encode, decode and clean URLs from one convenient tool.

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SEO Tools

SEO & Social Preview Checker

Preview how a webpage may appear in search engines and social platforms and check common metadata.

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SEO Tools

Meta Tag Generator

Generate title, description, canonical, robots, Open Graph, and Twitter meta tags with informational length tips.

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SEO Tools

Schema Markup Generator

Build Article, FAQ, Product, Organization, and other JSON-LD blocks. Validates JSON — not rich-result guarantees.

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SEO Tools

Robots.txt Generator

Create User-agent, Allow, Disallow, and Sitemap groups, including crawler-specific rules.

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SEO Tools

Robots.txt Tester

Test a path and user-agent against robots.txt with longest/specific rule matching.

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SEO Tools

XML Sitemap Generator

Build sitemap.xml from a URL list or CSV/text upload with loc and optional lastmod. No crawl in V1.

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SEO Tools

Sitemap Validator

Validate sitemap XML for root element, duplicates, missing loc, size, and nested indexes. XXE disabled.

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SEO Tools

Redirect Checker

Inspect public redirect chains with status codes, loop detection, and HTTP→HTTPS upgrades.

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SEO Tools

HTTP Header Checker

Review status, cache, CSP, HSTS, and related headers as Present, Missing, or Needs Review — never “secure”.

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SEO Tools

Hreflang Tag Generator

Generate alternate hreflang link tags from language/region rows with optional x-default.

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SEO Tools

Canonical URL Checker

Safely fetch a page and inspect HTML and HTTP Link canonicals for common issues.

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SEO Tools

AI Crawler Checker

Compare robots.txt against a verified AI crawler registry. Preferences only — not a hard guarantee.

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Security Tools

File Hash & Integrity Checker

Calculate file checksums and verify that a downloaded file matches an expected hash.

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Productivity

Time Zone Meeting Planner

Compare time zones and find convenient meeting times for people in different locations.

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Design Tools

Color & Accessibility Checker

Check color contrast, convert color formats and preview accessible text and interface combinations.

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Privacy & Trust

AI Prompt Privacy Checker

Detect sensitive information in AI prompts and create a safer version before sharing it with an AI service.

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Privacy & Trust

Privacy Redactor

Find and remove personal or sensitive information before sharing text.

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Privacy & Trust

Secret Leak Inspector

Scan logs, .env, JSON, and YAML for API keys, tokens, passwords, and connection strings, then create a safe copy.

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Privacy & Trust

Stack Trace Safe-Share Cleaner

Redact usernames, home folders, hosts, and common secrets from stack traces before you paste them into a ticket.

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Privacy & Trust

Photo Metadata Cleaner

View hidden photo metadata and remove private information such as GPS location before sharing.

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Privacy & Trust

Screenshot Privacy Redactor

Blur, pixelate or hide sensitive information in screenshots before sharing them.

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Privacy & Trust

Document Privacy Cleaner

Inspect documents for potentially revealing metadata and create a cleaner copy before sharing.

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Privacy & Trust

Content Credentials Checker

Inspect media for Content Credentials and provenance information when available.

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Privacy & Trust

AI Image Detector

Analyze an image for AI-generation signals, provenance information, metadata and forensic indicators directly in your browser.

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Privacy & Trust

Scam Message & Link Checker

Check messages and links for common scam, phishing and impersonation warning signs.

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Privacy & Trust

Encrypted One-Time Secure Note

Share temporary encrypted text using an expiring or one-time link.

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Image Tools

Image Compressor

Compress JPG, PNG, and WebP in the browser. Compare original and compressed size.

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Image Tools

Image Resizer

Resize by width, height, or percent. Instagram, YouTube, Facebook, and LinkedIn presets.

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Image Tools

Crop Image

Interactive crop with zoom, rotate, and 1:1, 4:3, 16:9, or 9:16 ratios.

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Image Tools

JPG to PNG

Convert a JPEG photo to PNG in your browser.

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Image Tools

PNG to JPG

Convert PNG to JPG with quality control and a background colour for transparent areas.

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Image Tools

WebP Converter

Convert WebP to JPG or PNG, and JPG or PNG to WebP.

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Generators

Password Generator

Create a strong random password with length, letters, numbers, and symbols.

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Generators

Password Strength Checker

Rate a password as Weak, Fair, Good, or Strong from length, variety, and patterns.

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Generators

Random Number Generator

Draw random integers from a range, with or without duplicates.

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Generators

Random Name Picker

Pick one or more names from a list for classrooms, giveaways, and meetings.

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Productivity

Decision Wheel

Spin a wheel of names or choices. Remove the winner or reset the list.

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Generators

QR Code Generator

Make QR codes for URLs, text, email, phone, SMS, and Wi-Fi. Download PNG or SVG.

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Developer Tools

JSON Formatter, Validator & Viewer

Format, validate, minify, repair, search and explore JSON directly in the browser.

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Developer Tools

JSON to Code Generator

Generate C#, TypeScript, Java, Python, or Go types from a JSON sample in the browser.

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Developer Tools

XML Formatter, Validator & Viewer

Format, minify, validate, search, and explore XML with a tree and XPath tester. DTDs are blocked.

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Developer Tools

YAML Formatter, Validator & Viewer

Format and validate YAML in the browser. Duplicate keys are reported. Unsafe tags are rejected.

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Developer Tools

Code Formatter & Beautifier

Format JavaScript, TypeScript, HTML, CSS, Markdown, GraphQL, JSON, XML, and YAML in the browser.

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Developer Tools

Base64 Encoder

Encode and decode Base64 without sending data to a server.

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Developer Tools

GUID Generator

Generate RFC-compliant GUIDs for local development work.

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Developer Tools

Webhook Signature Playground

Generate and verify HMAC-SHA-256, SHA-384, and SHA-512 signatures in the browser. The secret is not uploaded.

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Developer Tools

Regex Safety & Performance Inspector

Flag nested quantifiers and backtracking traps, then test matches in a worker with a timeout so the tab stays responsive.

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AI & Documents

AI Usage Disclosure Generator

Draft a plain-language disclosure for AI-assisted articles, images, videos, social posts, research, and reports.

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AI & Documents

AI Task Specification Builder

Turn a rough request into Objective, Inputs, Constraints, Output, Quality Criteria, Edge Cases, Validation, and Examples.

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PDF Tools

Merge PDF

Combine PDFs in the browser. Reorder, remove, and download one file.

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PDF Tools

Split PDF

Extract pages with ranges such as 1-3,7,9-12. Download a new PDF.

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PDF Tools

JPG to PDF

Put JPEG photos on Auto, A4, or Letter pages with margins and orientation.

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PDF Tools

PDF to JPG

Render PDF pages to JPEG. Download one page or all pages as a ZIP.

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PDF Tools

PDF Editor

Edit PDF files online by adding text, images, signatures, drawings, highlights, shapes, and page changes directly in your browser.

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PDF Tools

PDF Intelligence

Summarize long articles or PDFs into bullets, and translate PDFs while keeping layout.

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AI & Documents

Private PDF Chat

Ask questions about a PDF and find answers from the document.

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Career Tools

Resume Job Match Checker

Compare a resume with a job description and identify matching and missing skills.

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Calculators

Bill & Group Expense Splitter

Split a bill equally or by item, add tax, service, and tip, then see who pays whom. No loans or interest.

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Productivity

Calendar Event Maker

Create an .ics event with an IANA time zone, all-day dates, recurrence, and reminders. No calendar sign-in.

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Document Tools

Document Expiry Tracker

Track names and expiry dates with 7 to 180 day reminders. Download ICS, CSV, or JSON. ID numbers are not required.

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Productivity

Emergency Card

Optional contact fields as a local QR code. Anyone who scans it can read the same text. PNG or PDF. No server storage.

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File Tools

File Renamer

Rename many files with a preview table and templates. Download a ZIP. Only names, types, dates, and sizes are used.

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File Tools

Universal File Inspector

Upload a file to see type, size, metadata summary, and recommended tools or Smart Workflows. Processed in your browser.

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Productivity

Home Inventory

List rooms and household items in this browser. Optional photos stay in IndexedDB. Not an insurance valuation.

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Document Tools

Document Scanner

Turn a photo of a paper document into a clean, straightened scan.

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Image Tools

Passport & ID Photo Maker

Create properly sized passport, visa and ID photos from an existing photo directly in your browser.

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Document Tools

Receipt & Invoice Extractor

Extract merchant, date, lines, and totals from a receipt photo. You review every field. Download CSV, XLSX, or JSON.

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Productivity

Screenshot Guide Maker

Turn screenshots into a numbered step-by-step guide and download PDF, HTML, or ZIP.

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Gemini AI Tools

Gemini AI Chat

Chat with Google Gemini. Messages are sent to Google. Not processed locally.

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Gemini AI Tools

AI Writer

Draft emails and articles with Gemini. Briefs are sent to Google.

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Gemini AI Tools

AI Summarizer

Summarize pasted text with Gemini. The source is sent to Google.

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Gemini AI Tools

AI Rewriter

Rewrite text in another style with Gemini. The original is sent to Google.

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Gemini AI Tools

AI Proofreader

Proofread a draft with Gemini. The draft is sent to Google.

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Gemini AI Tools

AI Translator

Translate text with Gemini, including Urdu and Arabic. Source is sent to Google.

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Gemini AI Tools

Structured Data Extractor

Extract JSON fields from text with Gemini. The source is sent to Google.

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Gemini AI Tools

AI Code Assistant

Ask coding questions with Gemini. Snippets are sent to Google. Review every suggestion.

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Gemini AI Tools

AI Document Analyzer

Upload a PDF or document to Gemini for a summary, dates, or custom questions. Files are sent to Google.

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Gemini AI Tools

Gemini PDF Chat

Ask Gemini questions about an uploaded PDF. The file is sent to Google. Not the local Private PDF Chat.

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Gemini AI Tools

Multi-File Comparer

Compare two or more documents with Gemini. Files are sent to Google. Not legal advice.

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Gemini AI Tools

Gemini File Search

Index documents in a temporary Gemini File Search store and ask grounded questions. Cloud AI.

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Gemini AI Tools

Long Document Analyzer

Analyze a long pasted source or large file with Gemini. Content is sent to Google.

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Gemini AI Tools

AI Image Analyzer

Describe a photo or screenshot with Gemini. The image is sent to Google. Not a forensic report.

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Gemini AI Tools

AI Image Text Extractor

Read visible text in a photo with Gemini vision. AI-assisted extraction, not the local OCR tool.

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Gemini AI Tools

AI Alt Text Generator

Draft alt text or a longer description with Gemini. Edit before you copy. Image is sent to Google.

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Gemini AI Tools

AI Image Generator

Generate an image from a prompt with Gemini. Prompts go to Google. Limited to 3 per hour.

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Gemini AI Tools

AI Image Editor

Upload a photo and describe a change for Gemini. Not pixel-perfect. The image is sent to Google.

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Gemini AI Tools

AI Audio Analyzer

Summarize a recording with Gemini. The audio is sent to Google. Not a forensic transcript.

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Gemini AI Tools

Gemini Audio Transcriber

Transcribe speech with Gemini. Audio is sent to Google. Not the local Whisper extractor.

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Gemini AI Tools

Gemini Text to Speech

Generate speech from text with Gemini TTS. Text is sent to Google. Not the local browser voices.

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Gemini AI Tools

Live Voice Assistant

Talk to Gemini Live from your microphone. Audio is sent to Google. Limited to 3 sessions per hour.

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Gemini AI Tools

Live Camera Assistant

Share a camera feed with Gemini Live. Frames and audio are sent to Google. Limited to 3 sessions per hour.

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Gemini AI Tools

AI Video Analyzer

Describe a short clip with Gemini. The video is sent to Google. Not a forensic review.

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Gemini AI Tools

AI Video Summarizer

Summarize an uploaded clip with Gemini. Cloud AI. Timestamps are approximate.

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Gemini AI Tools

Video Q&A

Upload a video once and ask Gemini questions. The file is sent to Google and reused this session.

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Gemini AI Tools

YouTube Video Analyzer

Analyze a public YouTube URL with Gemini. DevNestro does not download or rip the video.

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Gemini AI Tools

AI Video Generator

Generate a short video with Gemini Veo when a paid host is configured. Limited to 1 per hour.

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Gemini AI Tools

AI Video Editor

Describe a change to an uploaded clip. Editing is not assumed available. Fails closed on the free tier.

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Gemini AI Tools

AI Web Research

Ask a research question with Gemini Search grounding when a paid host is configured. Limited to 5 searches per hour.

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Gemini AI Tools

AI URL Analyzer

Analyze a public URL with Gemini URL context. DevNestro does not fetch the page. Private addresses are blocked.

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Gemini AI Tools

AI Local Research

Ask about places with Gemini Maps grounding when a paid host is configured. Limited to 5 searches per hour.

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Gemini AI Tools

AI Data Analyst

Paste a table or upload CSV for Gemini code-execution analysis. Data is sent to Google. Verify every number.

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Gemini AI Tools

AI Math & Calculation Assistant

Solve arithmetic, statistics, and formulas with Gemini. Not a loan, mortgage, APR, or gambling calculator.

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Gemini AI Tools

Semantic Text Similarity

Compare two texts with Gemini embeddings. A high score is not proof they mean the same thing.

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Gemini AI Tools

Semantic Search

Index a short list of texts with Gemini embeddings and rank a query. Vectors stay in memory for this session.

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Gemini AI Tools

Multimodal Similarity

Compare text or a supported document with Gemini embeddings. Image and media combinations fail closed on gemini-embedding-2.

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Gemini AI Tools

Function Calling Playground

Send a prompt and a JSON function schema to Gemini. DevNestro shows the requested function and does not execute it.

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Gemini AI Tools

Gemini Agent Playground

Combine Gemini built-in tools. Search is paid-only. No server command execution and no arbitrary MCP URLs.

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Gemini AI Tools

Remote MCP Playground

Remote MCP is disabled by default. Public users cannot point DevNestro at an MCP URL.

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Gemini AI Tools

AI Batch Processor

Submit multiple prompts to the Gemini Batch API on a paid host. Check status and download results. Free tier fails closed.

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Gemini AI Tools

Long-Context / Cache Demo

Create a temporary Gemini context cache from a large source, then ask multiple questions. Paid host only.

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Privacy & Trust

Safe-to-Share File Inspector

Inspect PDF, DOCX, images, and text in your browser for PII, secrets, metadata, links, QR, and provenance before you share.

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Business Tools

Invoice Generator

Create invoices with live preview, templates, and decimal-safe totals. Download PDF or print. Nothing is stored.

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Business Tools

Quote Generator

Create quotes and estimates with the same totals engine as invoices, without invoice-only payment wording.

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Security Tools

QR Safety Inspector

Decode QR codes locally, classify payloads, and review URL risk indicators. Links are never opened automatically.

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PDF Tools

PDF Watermark

Add a text or image watermark to a PDF in your browser. Presets for CONFIDENTIAL, DRAFT, COPY, and SAMPLE.

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PDF Tools

PDF Page Numbers

Add page numbers to a PDF in your browser with formats like Page 1 of N, custom prefix/suffix, and six positions.

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PDF Tools

PDF Protect / Password

Password-protect a PDF with real encryption. Briefly processed on the server, never stored, password not logged.

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PDF Tools

Compress PDF

Compress a PDF in your browser. Recommended, Maximum Compression, or Best Quality. Size stats appear after processing.

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Image Tools

Background Remover

Remove image backgrounds in your browser with a local AI model. Export transparent PNG. No paid API upload.

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Career Tools

Resume Builder

Build a resume with live preview, ATS-friendly templates, browser drafts, PDF export, and print. Not ATS guaranteed.

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Data Tools

CSV / Excel Chart Maker

Turn CSV or Excel into bar, line, pie, doughnut, area, or scatter charts in your browser. Export PNG, SVG, or PDF.

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Image Tools

Batch Image Toolkit

Resize, compress, convert, rename, rotate, and strip metadata for many images, then download a ZIP.

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PDF Tools

Secure PDF Redactor

Mark sensitive PDF regions, rebuild affected pages so underlying text is removed, verify extraction, then download.

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Design Tools

Social Media Safe-Area Simulator

Preview YouTube, Instagram, Facebook, LinkedIn, TikTok, and X crops with safe-area and UI overlays. Last verified dates included.

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Privacy & Trust

Before-Publish Media QA

Orchestrate metadata, GPS, PII, secrets, OCR, Content Credentials, and safe-area checks into a Critical / Recommendations / Passed report.

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Data Tools

Spreadsheet Formula Auditor

Audit XLSX formulas locally for pattern breaks, errors, external links, and hidden content. No auto-fix.

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Language & Writing Tools

Dictionary & Word Meaning Finder

Look up word meanings, parts of speech, phonetics, and examples from open dictionary data with clear attribution.

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Language & Writing Tools

Synonym & Antonym Finder

Find synonyms and antonyms, with optional AI-labeled tone groups for formal, casual, or intense wording.

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Language & Writing Tools

Grammar & Writing Helper

Check grammar and clarity with Gemini, then try tone rewrites. Your draft is sent to cloud AI when you run a check.

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Language & Writing Tools

Rhyme Finder

Find perfect and near rhymes from a local open word list. Useful for lyrics, poetry, and word play.

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Language & Writing Tools

Word Finder

Find words by starts-with, ends-with, contains, length, and wildcards. A word-game helper — not an official Scrabble or Wordle product.

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Language & Writing Tools

Example Sentence Generator

Generate example sentences for a word in different styles using Gemini. Outputs are labeled AI examples.

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Language & Writing Tools

Pronunciation Helper

Hear a word with browser speech, see IPA when available from open dictionary data, and get a syllable estimate.

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Language & Writing Tools

Vocabulary Quiz

Practice vocabulary with AI-generated multiple-choice quizzes by topic and difficulty.

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Language & Writing Tools

Word of the Day

A new English word each day for everyone, chosen deterministically from an open word list, with optional AI explanation.

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Language & Writing Tools

Slang Explainer

Explain slang and informal phrases with Gemini, including register warnings when a term may be offensive or dated.

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Why DevNestro

A quiet, precise workspace for the small tasks that show up every day.

Fast

Format, encode, and generate without leaving the page or waiting on a round trip.

Private

JSON, images, notepad, and browser PDF tools stay on this page. File Share stores a file on this server for 24 hours. PDF translation uses only the AI endpoint you configure.

Practical

Image tools, text utilities, and PDF helpers in one quiet workspace.

What this site is

DevNestro is a collection of free tools and short original guides. You can count words, convert files, merge PDFs, compress images, check color contrast, or look for common privacy leaks in text you already have. Most of that work stays in your browser. A few tools use this web app for a session only, such as calculators. Temporary File Share keeps a file for 24 hours so you can send a link, then deletes it.

The articles explain how each tool works, what it does not claim, and when you should still review the result yourself. They are written for this site. See Features for the full catalog, About, Privacy, Terms, and Contact for who publishes the site and how to report a problem.

What we do not offer

There is no account, no paid unlock, and no promise that a checker makes a message or file guaranteed safe. Do not upload files you are not allowed to share.

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