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FileSlim
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Free Online File Tools

Quick answer: 25 free tools for images, PDFs and files — resize, crop, rotate, watermark, merge, split, convert and rename. Every one runs inside your browser, so there is no upload, no signup and no watermark. Need to shrink a file instead? Compress it on the homepage.

Private by design
Files never leave your device.
No queue, no limits
Runs at local CPU speed.
Works offline
Once loaded, no connection needed.

Image tools

Resize, crop, rotate, watermark and edit images without uploading them.

Resize Image
Resize by pixels or percentage, lock aspect ratio, batch to ZIP.
Crop Image
Drag a crop box or pick 1:1, 4:5 and 16:9 presets.
Rotate & Flip Image
Rotate 90/180/270 degrees and flip horizontally or vertically.
Watermark Image
Add text watermarks with opacity, position and tiling.
Passport Photo Resizer
US 600×600 under 240 KB, UK 600×750, Schengen 35×45 mm — cropped and compressed.
Meme Generator
Top and bottom captions with outline, straight from your photo.

PDF tools

Merge, split, organize, rotate, watermark and number PDF pages locally.

Merge PDF
Combine multiple PDFs into one and reorder them first.
Split PDF
Extract or remove pages visually.
Organize PDF Pages
Reorder, duplicate and delete pages on a thumbnail grid.
Rotate PDF
Turn selected pages or the whole document 90/180/270 degrees.
Crop PDF
Trim uniform margins off every page to remove whitespace.
Add Page Numbers
Number pages with position, start value and format options.
Watermark PDF
Stamp diagonal or centred text on every page.
Fill PDF Forms
Type into PDF form fields, flatten and download.
Compress PDF for Upload
Fit a PDF under 100 KB, 200 KB, 500 KB, 1 MB or 2 MB portal limits.
Protect PDF
Add an open password with AES-256 encryption and set permissions.

Converters

Change formats between images, PDFs and spreadsheets.

PDF to JPG
Render PDF pages to JPG or PNG at the DPI you choose.
JPG to PDF
Turn photos into a single PDF with page size and margins.
Convert Image
WebP, AVIF, JPG and PNG inter-conversion.
HEIC to JPG
Convert iPhone HEIC photos to JPG or PNG.
XLSX to CSV
Excel to CSV with multi-sheet support.
CSV to XLSX
CSV back to an Excel workbook.

File utilities

Batch rename, ZIP and render HTML — all in the browser.

QR Code Generator
QR codes for links, Wi-Fi, contacts and SMS. PNG or SVG, no tracking.
HTML to PDF
Paste HTML and render it to PDF or PNG locally.
Batch Rename & ZIP
Rename files with a pattern and bundle them into one ZIP.

Compression — the main event

Shrinking files is what FileSlim does best. Drop anything on the homepage, or jump straight to a dedicated compressor.

Compress Files
Images, PDFs, documents and audio — the FileSlim homepage drop zone.
Compress PDF
Shrink PDFs without visible quality loss.
Compress Image
JPG, PNG, WebP and AVIF compression with quality presets.
Compress Audio
MP3, WAV and M4A down to compact Opus.
File Size Reducer
Reduce any file — photo, PDF, document or audio — right on the page.

Frequently asked questions

Do these tools upload my files?

No. Every tool on this page runs in your browser using Canvas, WebAssembly and pdf-lib. Your files are read from disk into memory and never sent to a server, which is why the tools also work offline once the page has loaded.

Do I need an account?

No signup, no email and no limits on how many files you process. FileSlim is funded by ads on the page, not by your data.

Where do I compress files?

Compression is FileSlim's core product and lives on the homepage drop zone, which handles images, PDFs, documents and audio in one batch. The tools on this page cover everything else.

Is there a file size limit?

There is no server limit. The practical ceiling is your device's memory — batches over roughly 500 MB will warn you, and 1 GB is the hard stop per batch.