Nerulio.
All toolsStudioNo upload · processed on this device

Merge PDF

Combine PDF files and review page order before exporting. Copy original pages into a new PDF on your device; digital signatures are not preserved.

Drop PDF · image files hereProcess many files at once
No upload · processed on this device

Making a game?

Nerulio is a 2D game asset studio first: draw pixel art, cut sprite sheets into animations, pack texture atlases, check autotile tilesets and export them for Godot, Unity, Phaser and other engines. It runs in your browser; files stay on your device.

Open the game studio →All game toolsSprite sheet slicerSprite sheet packerAutotile tilesets

Merge PDF

Combine PDF files and review page order before exporting. Copy original pages into a new PDF on your device; digital signatures are not preserved.

How it works

  1. Add the PDF files you want to combine
  2. Arrange the pages and remove unwanted ones
  3. Export one PDF and check the page order

Supported formats

PDF → PDF — Input decoding and output encoding depend on browser support.

What this tool does

Combine source page objects in the chosen order.

Implementation and verified quality

basic · PDF worker / native page objects. Quality qualification is in progress. Pro/Flagship quality has not been established.

Before you export

Preserve mode retains native text, search and vectors; signatures are not retained. Font trimming drops the outlines of glyphs the document does not draw, and grayscale and raster mode are irreversible — raster mode removes searchable text. A forgotten password cannot be recovered, and unknown passwords are never guessed. The writer still parses full documents in a Worker.

Frequently asked questions

What determines the supported size?

Actual device memory, storage and codec support. Tested examples are evidence, not a guarantee for every file.

Are my files uploaded?

This tool processes the files you open on your device without uploading them. Images you explicitly attach to community posts are uploaded separately. Optional engines and models are downloaded from third parties; those requests expose connection information such as your IP address.

Will my work be saved automatically?

No. Images and editing state stay in this tab; media output can use local temporary storage. Changing language preserves your work; reloading, closing the tab, or following a link to another page can clear it.