Tools

Check WCAG 2.1 AA and AAA contrast ratios between any two colours. Live preview, pass/fail matrix, and preset pairs for accessible design.

Convert plain text to binary (UTF-8 / ASCII 8-bit groups) and decode binary back to readable text, instantly in your browser.

Convert CSS pixels to REM and REM to pixels instantly. Customizable base font size, bidirectional real-time conversion, and a CSS reference cheat sheet.

Generate high-quality QR codes for any URL or text, downloadable as PNG or SVG.

Generate customized Lorem Ipsum placeholder text — paragraphs, sentences, words, or lists — with optional HTML tag wrapping.

Generate up to 500 UUID v4 or ULID identifiers in bulk, copy them individually or all at once, and decode the embedded timestamp from any ULID or UUID v1.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files instantly in your browser. Verify checksums with the built-in comparator. 100% client-side.

Upload an MP3 or WAV file, trim start and end points, visualize the waveform, and verify a perfectly seamless gapless loop using the Web Audio API. Download the trimmed region as a WAV file.

Upload an audio file, drag visual handles to select a start and end range, preview it in real-time, and export the trimmed clip as lossless WAV or 192 kbps MP3.

Convert JPG, PNG, and WebP images into a single PDF document in your browser. Reorder pages, rotate images, choose page size and margins -- no uploads, 100% private.