All 358 Free Online Developer Tools
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11 categoriesAll Tools
AlphabeticalFree URL Shortener - Shorten Long Links Instantly
Free URL shortener. Shorten long links instantly with no signup. Create clean, shareable short URLs for social media, messaging, and more.
Free Venn Diagram Maker - 2, 3, 4 Circles Online
Create 2, 3 or 4 circle Venn and Euler diagrams in your browser. Custom labels, colors, area-proportional sizing, SVG and PNG export. No signup.
NewFree YAML Validator - Validate & Format YAML Online
Free YAML validator and formatter. Validate YAML syntax, fix errors with line numbers, and format YAML for better readability. No signup required.
Gamepad Tester - Test Controller and Stick Drift
Free online gamepad tester. Test every button, trigger and analog stick. Measure stick drift and deadzone. Export a diagnostic report. 100% private.
GIF Maker - Video & Images to GIF Free
Free GIF maker. Create animated GIFs from video or images. Trim, resize, FPS, loop, reverse. 100% private, no upload, no signup.
GIF to MP4 Converter - Free Online GIF to Video
Free GIF to MP4 converter. Convert animated GIFs to MP4 video files online. Reduce GIF file size by 90% with H.264 compression. 100% private, no upload.
Gold Price Tracker - Live Spot Gold Prices & Charts
Track live gold spot prices (XAU/USD). Free real-time gold price tracker with interactive charts. Updated every minute. No signup required.
GPA Calculator - 4 Scales, Semester & Cumulative
Free GPA calculator with 4 scales (US 4.0/4.3, Indian 10.0, percentage), unlimited semesters, prior GPA integration, target GPA planner, and Honors/AP/IB.
Grade Calculator - Weighted Average & Final Exam
Free grade calculator. Calculate weighted average grade, what you need on the final exam, and GPA. No signup, 100% private browser tool.
Graphing Calculator - Roots, Area & Fit
Free graphing calculator. Plot functions, polar, parametric and implicit curves, then get roots, turning points, area between curves, integrals and R2.
NewHabit Tracker - Free Daily Streak Builder
Free online habit tracker. Daily routines, streaks, heatmap, goals. No signup, 100% private. AI cannot track your habits - we do.
Hash Generator - MD5 SHA-1 SHA-256 SHA-512
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes for any text or file, and compare two hashes to verify a download. Runs locally, nothing is uploaded.
Hashtag Generator - Instagram, TikTok, YouTube, Twitter
Free hashtag generator for Instagram, TikTok, YouTube, Twitter, LinkedIn and Facebook. Platform-aware rules, 6 categories, copy-all, live character count.
HEIC to JPG Converter - Free iPhone Photo Converter
Free online HEIC to JPG converter. Convert iPhone HEIC photos to JPEG instantly in your browser. Batch convert unlimited photos. No upload, 100% private.
htaccess Redirect Tester - Test Rewrite Rules Online
Free htaccess redirect tester. Paste .htaccess rules and a URL, see which rule matched and why, and get the corrected line for the mistake.
NewHTML Entity Encoder and Decoder - Encode Special
Free online HTML entity encoder and decoder. Encode special characters like &, <, > and quotes to HTML entities, and decode them back. 100%.
HTML Formatter - Format & Beautify HTML
Free HTML formatter. Beautify and minify HTML with correct indentation, and catch unclosed tags and invalid nesting before production. No upload.
HTML Playground - Live Code Editor Preview
Free HTML playground with live preview. Write and test HTML, CSS, JavaScript code instantly in your browser. No signup, 100% private.
HTML Table Generator - Visual Table Builder
Free HTML table generator. Create responsive HTML tables visually with editable cells, border styling, striped rows, and live preview. Copy clean HTML.
HTML to Image Converter - Free HTML to PNG, JPG, WebP
Free HTML to image converter. Paste HTML or CSS, render to PNG, JPG, or WebP with custom width, height, scale, and background. Full-page or viewport-only.
HTML to Markdown Converter - Free Online Tool
Free HTML to Markdown converter. Paste HTML, get clean Markdown. Supports tables, code blocks, links, images, nested lists, heading styles, and more. 100%.
HTML to PDF Converter - Free Online HTML to PDF
Free HTML to PDF converter. Paste HTML code, customize page size, orientation and margins. Live preview, download as PDF. No upload, 100% private browser.
HTTP Status & Header Checker Online
Free HTTP status checker. Check response codes, security headers, redirect chain, and response time for any URL. AI cannot check real HTTP headers - we do.
IBAN Validator and Checker - Validate Numbers
Free IBAN validator and checker. Validate International Bank Account Numbers with MOD-97 checksum. Supports 80+ countries. 100% private browser. No signup.
Image Color Picker - Pick Colors from Photo Online
Free online image color picker. Upload any photo and click to pick exact pixel colors. Get HEX, RGB, HSL, CMYK values instantly. No upload, 100% private.
Image Compressor - Reduce Image File Size Online Free
Free online image compressor. Reduce image file size without losing quality. Supports JPG, PNG, WebP. No upload, privacy-first processing.
PopularImage Cropper - Crop Photos with Aspect Ratio
Free online image cropper. Crop with aspect ratio presets, rotate, flip and zoom. Social media sizes for Instagram, Facebook and Twitter. No upload.
NewImage Enhancer - Free Photo Quality Booster
Free image enhancer. Brightness, contrast, saturation, vibrance, sharpness, denoise, HDR and color temp in real time. 9 pro filters plus Auto Enhance.
NewImage Extender - AI Outpaint & Uncrop Free Online
Free AI image extender. Outpaint & uncrop photos to 16:9, 9:16, 21:9, 1:1, social ratios with 5 fill algorithms. No signup, 100% private.
Image Format Converter - Free Online JPG PNG WebP Converter
Free online image format converter. Convert between JPG, PNG, WebP, GIF, BMP, TIFF instantly. No upload, 100% private, browser-based conversion.
Image to Base64 Converter - Encode Images Online Free
Free online image to base64 converter. Convert any image to base64 string, data URI, HTML img tag, or CSS url(). Supports PNG, JPG, WebP, GIF. 100%.
Image to Excel Converter - Free JPG PNG to XLSX Online
Free image to Excel converter. Convert JPG, PNG, WebP, HEIC photos, scanned tables and screenshots to editable XLSX. Auto-detect rows and columns.
Image to PDF - Convert JPG PNG WebP HEIC to PDF Free
Free image to PDF converter. Combine JPG, PNG, WebP, HEIC, BMP, GIF into one PDF. Page size, orientation, margins. No upload, 100% private.
NewImage to Word Converter - Free JPG PNG to DOCX Online
Free image to Word converter. Convert JPG, PNG, WebP, GIF, BMP, HEIC photos into editable DOCX, RTF, or TXT. 12+ languages, batch OCR, 100% private.
Image Upscaler - AI Enhance Photos to 4K
Upscale images to 2x, 3x or 4x with edge-aware sharpening and denoise controls so photos stay sharp. In your browser, no upload, no signup.
NewImage Vectorizer - Free PNG JPG to SVG Converter Online
Free image vectorizer. Convert PNG, JPG, WebP, BMP and GIF to scalable SVG in your browser. 9 presets plus color count, blur and threshold. No upload.
NewImage Watermark - Add Text and Logo to Photos
Free online image watermark tool. Add text or logo watermarks to protect your photos. Custom position, opacity, rotation, tile mode, font, color. 100%.
Income Tax Calculator 2026 - US India UK
Free income tax calculator 2026 with US federal, India new/old regime, and UK brackets. No signup, private. AI gives wrong tax brackets.
Inflation Calculator - CPI Dollar Adjuster
Adjust any dollar amount for real US inflation with official monthly CPI data since 1913. Shows exact indexes used. 100% private.
Investment Calculator - Profit and Portfolio Tracker
Free investment calculator with portfolio tracker. Calculate stock profit, ROI, dividend yield, and average cost basis across multiple lots. No signup.
IP Address Lookup - Find Your IP Address
Find your public IP address, then the ISP, country, city and connection type behind it. Paste any address to look it up too. No signup, lookups not stored.
Is It Down? - Website Down Checker
Free website down checker. Check if any website is down for everyone or just you. Real-time status, response time, and HTTP code. No signup, 100% free.
JavaScript Obfuscator - Protect JS Code Online
Free online JavaScript obfuscator. Protect your JS code with variable renaming, string encryption, control flow flattening, and more. 100% private browser.
JS Formatter and Beautifier - JavaScript Code
Free online JavaScript formatter and beautifier. Beautify messy JS, minify for production, validate syntax. No signup, 100% private browser processing.
JSON Diff - Compare Two JSON Documents and Find
Free JSON diff tool. Compare two JSON documents and see differences instantly. Highlights added, removed, and modified values. Side-by-side view.
JSON Formatter - Format & Validate JSON
Free JSON formatter. Format, minify and beautify JSON, convert to and from YAML, and get the exact line of any syntax error. 100% browser, no upload.
PopularJSON Schema Validator - Validate JSON Against Schema Online
Free online JSON Schema validator. Validate JSON data against Draft-07, 2019-09, and 2020-12 schemas. Detailed error paths, all-errors mode. No signup.
JSON to CSV Converter - Bidirectional Online Data Converter
Free JSON to CSV converter and CSV to JSON online. Flatten nested objects, auto-detect input, table preview, export file. 100% private.
NewJSON to TypeScript Converter - Free Interface Types
Free JSON to TypeScript converter. Generate TypeScript interfaces, types, and Zod schemas from JSON. Deterministic output, no hallucination. 100% private.
JSON to XML Converter - Free Bidirectional Online Tool
Free JSON to XML converter and XML to JSON. Bidirectional with attribute handling, root element control, indentation options, syntax validation. 100%.