Nerulio.
All toolsStudioNo upload · processed on this device

Protect PDF

Set an AES-256 open password and choose what printing, copying and editing it allows. The password never leaves this device.

Drop PDF 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

Protect PDF

Set an AES-256 open password and choose what printing, copying and editing it allows. The password never leaves this device.

How it works

  1. Open the source file
  2. Choose the processing mode and settings
  3. Run, inspect the result and download

Supported formats

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

What this tool does

Write an AES-256 (revision 6) open password and choose which printing, copying and editing permissions it grants.

Implementation and verified quality

basic · WebCrypto AES-256 standard security handler (revision 6). 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. basic

Are my files uploaded?

Nerulio processes selected files on your device and has no file-upload API. 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.