OddLab

A lab of free online tools. Everything runs in your browser.

12 tools available

converter

Number Base Converter

Convert numbers between any bases 2 to 36 with BigInt precision, an editable bit grid, two's complement view, step-by-step working, bitwise operations, and a text-bytes pane.

  • binary
  • hex
  • bases
  • bigint
  • bitwise
  • developer

Color Converter

Convert colors between HEX, RGB, HSL, HWB, CMYK and LAB with every field editable, a WCAG AA/AAA contrast checker, harmonies, and copy-ready CSS.

  • colors
  • hex
  • rgb
  • hsl
  • wcag
  • css

Image Format Converter

Convert images between PNG, JPG and WEBP with a live output-size preview while you drag quality, alpha-fill control, resize, and batch ZIP download — all in your browser.

  • images
  • png
  • jpg
  • webp
  • compression
  • batch

Unit Converter

Convert between 12 categories of units with a live all-units panel, compound input like 6'3" or 10 st 4 lb, and visible conversion formulas.

  • units
  • measurement
  • calculator

pdf

Compress PDF

Shrink PDFs by re-encoding and downsampling images and stripping metadata, with measured before/after sizes and a guarantee to never return a bigger file.

  • pdf
  • compress
  • optimize
  • file-size

Merge PDF

Combine PDFs and PNG/JPG images into one PDF — reorder files or individual pages, rotate pages before merging, and add bookmarks from filenames.

  • pdf
  • merge
  • combine
  • organize

Rotate PDF

Rotate PDF pages in 90-degree steps — one page, a page range, or whole documents at once — using the lossless PDF rotation flag, with undo.

  • pdf
  • rotate
  • pages
  • scan

Split PDF

Split a PDF into multiple files by page count, page ranges, cut points, even/odd pages, or a maximum file size — with a preview of how many files you will get.

  • pdf
  • split
  • extract
  • ranges

text document

Bold-First Reader

Reformat text so each word leads with bold letters and a dimmed tail, with a fixation slider, dimming control, and rich text, HTML, and Markdown export.

  • reading
  • text
  • formatting
  • accessibility

Case Converter

Convert text between eight case styles with title-case presets, abbreviation-aware sentence case, and live character, word, line, and byte counts.

  • text
  • case
  • converter
  • editing

Lorem Ipsum Generator

Generate lorem ipsum filler as paragraphs, sentences, words, list items, or bytes in plain text, HTML, or Markdown, with seeded reproducible output.

  • lorem-ipsum
  • filler-text
  • generator
  • design

Text Cleaner

Clean pasted text with ten live, non-destructive operations for whitespace, line breaks, tabs, HTML tags, punctuation, and invisible characters.

  • text
  • whitespace
  • cleanup
  • editing