Free online tools
derar.dev tools are free, private utilities for everyday work: PDF editing, image conversion, developer helpers and a resume builder. No account is needed, and most tools run entirely in your browser.
PDF Tools
Merge, split, compress and edit PDFs in your browser
Free, private PDF tools that run in your browser: merge, split, compress, convert to images or text, sign, annotate, watermark and more.
Image Tools
Convert, resize, crop and compress images
Convert between formats, resize, crop, compress, strip metadata, watermark and export icon and social packs.
Developer Tools
JSON, JWT, Base64, regex, cron and formatter utilities
Local developer utilities: JSON toolkit, JWT debugger, Base64, URL encode/parse, regex, cron, diff, hashing, formatters and more.
CanvasCV
Free resume builder, no account needed
Build an ATS-friendly resume step by step with on-device AI suggestions, templates and PDF export. No sign-up, no credit card.
Every tool, by category
Developer Tools
- JSON Formatter
- Base64 Encoder/Decoder
- JWT Decoder
- URL Encoder/Decoder
- URL Parser
- UUID Generator
- Hash Generator
- Unix Timestamp Converter
- Regex Tester
- Diff Checker
- Case Converter
- Lorem Ipsum Generator
- Password Generator
- Color Converter
- Cron Expression Parser
- HTML Entity Encoder
- Word Counter
- Markdown Preview
- QR Code Generator
- CSS Formatter
- HTML Formatter
- JSON YAML CSV Converter
- Number Base Converter
- HTTP Status & MIME Lookup
- Chmod Calculator
- JSON to TypeScript
Questions about these tools
Are these tools really free?
Yes. Every tool on derar.dev is free to use with no account, no watermark and no usage limit beyond the file-size limits each tool lists.
Are my files uploaded?
PDF tools, developer tools and the resume builder run in your browser, so your files and text stay on your device. Image Tools processes images on the server with sharp to support more formats; images are processed in memory and not stored.
Who builds these tools?
They are built and maintained by Derar Sattouf, a full-stack developer and AI engineer. Each tool is a small, focused utility he uses in his own work.
Last updated: October 2026 · Built by Derar Sattouf