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Kalio
4 tools

PDF tools

Merge, split, shrink and export documents locally.

Nothing is uploaded. This tool runs entirely inside your browser tab. Your files and figures stay on your device - we never receive them, so we cannot read, store or lose them.

Documents that stay confidential

PDFs are where the privacy question stops being abstract. Contracts, medical records, bank statements, signed agreements and identity documents all arrive as PDFs - and the popular online tools all upload them.

These tools parse and rebuild documents inside your browser using pdf-lib and pdf.js, the same rendering engine Firefox uses for its built-in viewer. Nothing is transmitted, so there is no retention window to trust and no queue to wait in.

The tools

  • Merge PDF - combine documents in any order, with page counts shown so you can confirm you have the right files.
  • Split PDF - extract page ranges, split into single pages, or break into fixed-size chunks.
  • Compress PDF - two honest modes, one lossless and one that rasterises, with the trade-off stated before you run it.
  • PDF to JPG - render pages to images at up to 300 dpi.

What merging and splitting preserve

Page content, embedded fonts, images and vector graphics are copied exactly - nothing is re-rendered, so quality is untouched and text stays selectable. Document-level structures (bookmarks, form field definitions, digital signatures) do not survive, because they belong to the source document rather than to individual pages. In particular, merging invalidates a digital signature, because a signature certifies one specific byte sequence.

On file size limits

There is no limit imposed by us, because there is no upload. The real constraint is your device’s memory: a few hundred megabytes is generally fine on a desktop, considerably less on a phone. If a very large document fails, process it in parts.