Nerulio.
All toolsStudioNo upload · processed on this device

Unlock PDF

Enter the password and get a PDF that opens without one — the printing and copying restrictions go with it.

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

Unlock PDF

Enter the password and get a PDF that opens without one — the printing and copying restrictions go with it.

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

Remove an AES-256, AES-128 or RC4 open password you know, together with the owner restrictions it carried.

Implementation and verified quality

basic · byte-level object rewriter / AES-256, AES-128 and RC4 standard security handlers. 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.