Merge, split and convert PDFs, and convert audio, without uploading anything

Five new file tools on Omikuji Tools. They process files inside your browser: nothing is uploaded, and there is no queue and no size-based pricing.

Merge PDF

Tool What it does
Merge PDF Combine up to 100 PDFs in any order, with page-one thumbnails
Split PDF Extract, delete or split by page ranges such as 1-3, 5, 8-; rotate pages
PDF to Image PNG, JPEG or WebP at 72 to 600 dpi, one file per page or a ZIP
Image to PDF Choose paper size, orientation and margins; JPEGs are embedded without re-encoding
Audio Converter Convert to WAV, M4A (AAC) or WebM (Opus); trim, downmix to mono, change sample rate

Audio Converter

A few details worth knowing

  • JPEG stays lossless. When you turn photos into a PDF, the JPEG bytes are embedded as they are. Rotation from EXIF is applied on the PDF page, so a phone photo is not re-compressed just to turn it upright.
  • Encrypted PDFs are refused with a clear message rather than producing a broken file.
  • Very large renders shrink gracefully. Rendering an A4 page at 600 dpi exceeds the canvas limit on iPhones; the tool halves the resolution until it fits and tells you.
  • AAC depends on your OS. The audio converter checks at startup which encoders your browser has (Linux builds of Chrome and Firefox have no AAC) and greys out what is not available. There is no MP3 output: every browser-side MP3 encoder I found is LAME-derived, and I am not comfortable shipping that.
  • No PDF compression tool, on purpose. It cannot be done reliably in the browser without degrading images, so I would rather not offer it.

👉 Omikuji Tools: file tools

Comments

Post a Comment

Popular posts from this blog

Amidakuji (Ghost Leg) maker: a fair random pairing tool for up to 200 people, entirely in the browser

Image
Amidakuji is the Japanese ladder lottery: names go along the top, prizes or roles along the bottom, and each person traces a path down a ladder with random rungs. Every name lands on exactly one result, and nobody can predict it. Offices in Japan use it for seating, task assignment and drawing lots. I built a browser version that works for up to 200 people. How it works Enter names (and optionally results). Paste a column from a spreadsheet and the rows fill in automatically; tab-separated "name → result" pairs work too. Press Draw and watch each path animate down the ladder, or reveal them one at a time. Nothing is sent to a server. The whole lottery (names, results, and the random seed for the rungs) lives in the URL after the # , so you can hand the link to others and they will open exactly the same ladder. Cheat prevention : turn it on and the results stay hidden until every path has been traced. Redrawing changes the seed, so a new link means a new draw. Share...
Read more

omikuji.dev: free browser-based tools, puzzle games and reference sites made in Japan

Image
This blog is where I post news about the sites I build and run under omikuji.dev . Everything is free, needs no sign-up, and wherever possible runs entirely in your browser so that nothing you type or drop into a page ever leaves your device. What is there Omikuji Tools — about 130 small web tools: timers and clocks, a ladder lottery, PDF and audio converters, text converters, network checks (SSL certificate, DNS, IP address), calculators and print templates. Most are available in 12 languages. omikuji games — 105 browser games (puzzles, logic, arcade, brain training, play against the CPU, and games for small children). Everyone gets the same daily puzzle and can post to that day's leaderboard. Japanese only for now. Reference sites — a kaomoji dictionary (59,000 Japanese text faces), an emoji dictionary, a dictionary for the Japanese word game shiritori , traditional colors of the world with sources, and a guide to etiquette mistakes travelers make abroad. These are in Ja...
Read more

Hakarasenai: a Firefox extension that only stops Google Analytics from measuring you

Image
The second piece of software I publish is Hakarasenai , a Firefox extension for desktop and Android. The name means "won't let it measure", and that is the entire feature list: it stops Google Analytics from measuring you. Free, MIT licensed, on addons.mozilla.org (v1.2.0). Why it exists Google ships an official "Google Analytics Opt-out Add-on", and there is a Firefox build of it. The trouble is how it works: it injects a <script> element into the page, and Firefox, like Safari, applies the page's own Content Security Policy to content scripts. On any site with a strict CSP the injection is blocked and the opt-out quietly does nothing. Nothing tells you it failed, which is the worst failure mode a privacy tool can have. I ran into this while trying to keep my own visits out of the GA4 properties of my sites, and wrote this instead. Two layers It tells the Google Analytics code on the page that you have opted out, using the same official hook...
Read more