Free online file tools

PDF tools

• Compress PDFShrink a PDF by re-encoding its pages
• Extract Images from PDFPull embedded images out as a ZIP
• Merge PDFCombine several PDFs, drag to reorder
• Delete Pages from PDFRemove pages and reorder what remains
• Rotate PDFTurn pages 90°, 180° or 270°
• Split PDFExtract page ranges or split per page

Subtitle tools

• Subtitle CheckerNine timing and formatting checks
• Subtitle CPS CheckerReading speed per cue, sortable
• Subtitle FPS ConverterRescale timecodes between frame rates
• Subtitle Overlap FixerFind overlapping cues, fix three ways

Lyrics tools

• LRC to SRT / VTT ConverterTurn timed lyrics into SRT or VTT
• LRC Offset EditorShift lyric timestamps, globally or per line

EPUB tools

• Translate an EPUBTranslate a book with your own API key
• EPUB ValidatorStructural checks on the EPUB package

What “runs in your browser” actually means

These pages are static HTML with a small amount of JavaScript. When you drop a file, the browser reads it from your disk into the tab’s own memory and the tool works on it there — pdf-lib for PDFs, our own parsers for subtitle, lyrics and EPUB files. With one exception the tools never upload anything — Translate an EPUB sends the book’s text to a provider you choose under your own API key, and says so on its page. You can confirm it in your browser’s network panel: while a tool runs, the only things it fetches are its own code files from ketchio.com, and every request is a plain GET with no body.

What that costs you

Local processing is not free of trade-offs. Your machine does the work, so a large PDF is bounded by your own RAM rather than a server farm — somewhere past a few hundred megabytes a phone will give up where a laptop keeps going. Nothing is saved between visits, so a file you close is gone. And each tool page says plainly what it cannot do, because a tool that hides its limits wastes more of your time than one that admits them.