tools.bluejar.org
Small tools.
No install required.
A collection of standalone browser-based utilities by Chris Holt. Each tool is self-contained — no dependencies, no build step, no server.
Tools
Open any local folder of text files and browse, read, and edit them in the browser. Renders Markdown, highlights code, and previews HTML — all offline after first load.
Encode, decode, hash, and transform text. Base64, URL encoding, HTML entities, hex, binary, ROT13, Morse code, SHA hashing, and CIRCL file hash lookup — all offline.
Sort, clean, transform, and label any list. Supports alphabetical, numeric, date, name, and random ordering — plus case conversion, deduplication, find/replace, and more.
Generate 1D barcodes in Code 128, EAN-13, UPC-A, Code 39, and ITF. Customize colors, size, label, and rounded corners. Export as PNG or SVG.
Generate QR codes and Data Matrix codes. Choose pixel style, overall shape, error correction level, and optionally embed a center logo. Export as PNG or SVG.