Yes. All 42 tools are 100% free with no signup, no ads in your face, and no hidden limits. The core tools will always be free.

Do AHX tools upload my data to a server?

No. Every tool runs entirely in your browser using JavaScript. Your data never leaves your device.

Can I use AHX offline?

Yes. Once the page has loaded, every tool works without an internet connection. AHX is installable as a PWA.

42 Free Online Tools Every Developer Needs

Developers need quick, reliable tools for everyday tasks — formatting JSON, decoding JWTs, testing regex patterns, generating hashes, and more. AHX is a collection of 42 free online tools that run entirely in your browser. No signup, no upload, no tracking.

Developer tools

• JSON Formatter: Format, minify, and validate JSON with error line numbers
• JWT Decoder: Decode JWT header and payload, check expiry
• Regex Tester: Test patterns with replace mode and quick patterns library
• Hash Generator: SHA-1/256/512, MD5 — text and file hashing
• Base64 Encoder/Decoder: URL-safe mode supported
• UUID Generator: UUID v1/v4, bulk generate up to 100
• URL Encoder/Decoder: Percent encoding for URLs
• Number Base Converter: Binary, octal, decimal, hexadecimal
• Code Minifier: Minify HTML, CSS, and JavaScript
• CSV to JSON Converter: Bidirectional, 4 delimiter options
• Slug Generator: URL-friendly slugs with custom separators
• Text Diff Checker: Line and word-level LCS diff

Image and PDF tools

• Image Compressor: 90% reduction, JPG/PNG/WebP
• Image Resizer: 8 preset sizes (Instagram, YouTube, etc.)
• Image Cropper: 8 aspect ratio presets + rule of thirds
• Image Format Converter: Batch convert JPG/PNG/WebP
• Image to PDF: Convert images to a single PDF
• PDF Merger: Combine multiple PDFs
• PDF Splitter: Split by pages or custom ranges
• PDF to JPG: Convert each page to JPG
• OCR (Image to Text): Extract text from images, 10 languages

Calculators and converters

• Scientific Calculator: Trig, log, factorial, DEG/RAD toggle
• Unit Converter: 7 categories + swap button
• Color Picker: 5 formats (HEX/RGB/HSL/HSV/CMYK) + contrast checker
• CSS Gradient Generator: Linear, radial, conic + 12 presets
• Age/BMI/Loan/Percentage calculators
• Plus 208 unit conversion pages (cm-to-in, kg-to-lb, etc.)

All tools run 100% client-side using JavaScript. Heavy libraries (pdf-lib, Tesseract.js, PDF.js, qrcode) are lazy-loaded only when needed, so pages stay fast. The site scores 96-98 on Lighthouse Performance.