Free document converter — PDF, images, and more
Every FileShrink document converter runs entirely in your browser through pdf-lib and pdfjs. Your files never touch a server — no uploads, no logs, no size limit beyond your device’s memory.
Working with documents on the web means constantly bumping into format incompatibility. A portal expects PDFs when you have JPGs. A design tool rejects PDF and wants a PNG. An email client strips an attachment because it is too large. A scanned report arrives as a stack of images when you need one tidy document. Document conversion is the glue that makes these workflows actually work, and doing it in the browser instead of uploading to a third party keeps your content private, your bandwidth bill at zero, and your turnaround measured in seconds.
Below you will find every document converter FileShrink currently offers. The image-to-PDF tools use pdf-lib, a pure-JavaScript library that embeds your JPG or PNG into a one-page PDF without re-compressing anything. The PDF-to-image tools use pdfjs (Mozilla’s PDF renderer) to rasterize the first page of your PDF at high resolution and hand it back as JPG, PNG, or WEBP. Everything runs in your browser, which means there is literally no way for FileShrink to see your documents.
All document converters
Which document format should you pick?
Document formats each solve a different problem. Here is the landscape for the conversions FileShrink currently supports, with the rules of thumb for picking the right one.
The universal distribution format. PDF preserves exact layout, fonts, and pagination across every device and every viewer. It is the right format when the recipient needs to print the file, when you want precise control over how every page looks, or when you need to bundle multiple pages in a single file. The trade-off: PDFs are harder to edit than word processor documents, and they are not meant to be parsed programmatically by software that is not specifically PDF-aware.
JPG or PNG page images
When you need a single page of a PDF as a web-friendly image — for a thumbnail, a social media share, a CMS upload, or a quick preview — rasterizing to JPG or PNG is the right move. JPG produces smaller files on photographic content. PNG preserves text and line art with perfect sharpness. WEBP offers the best of both worlds for modern destinations.
Image to PDF (single page)
Sometimes the reverse is what you need: a photo of a handwritten note, a scan, or a screenshot that has to be delivered as a proper PDF because the receiving system requires it. The tools in this category wrap an image into a single-page PDF at the image’s native resolution, with no quality loss and no added pages.
Quick decision guide
- Uploading a screenshot to a portal that only accepts PDFs?
- Use image-to-PDF. It wraps the screenshot in a single-page PDF at the original resolution.
- Need one page of a PDF as a web-friendly image?
- Convert PDF to JPG for photographs, PDF to PNG for text-heavy pages, PDF to WEBP if your destination is a modern website and size matters most.
- Sharing a PDF preview on social media?
- Rasterize the first page to JPG or WEBP. Social platforms expect raster thumbnails and will not render PDFs inline.
- Building a document pipeline where each page needs a thumbnail?
- PDF to JPG is the fastest path for the first page. Full-document thumbnailing (every page) requires a batch pipeline we are planning for a later release.
- Merging several scanned images into a single document?
- Convert each image to PDF here, then combine them with a merge tool. A dedicated multi-image-to-PDF pipeline is on the roadmap.
Why convert documents in your browser?
Privacy by design
Confidential documents stay on your device. The conversion libraries run in your browser and we have no server that ever sees the file. Corporate NDAs, legal docs, financial statements — none of it leaves your machine.
No size limit from us
Server-based converters cap uploads (often at 10 to 25 MB) because bandwidth costs money. Client-side conversion has no such cap — the only limit is how much RAM your device can allocate to the conversion.
Works offline after loading
Once the page and its libraries are loaded, the tool keeps working without an internet connection. Useful on a plane, on a flaky hotel Wi-Fi, or in a secure environment with no external network.
Free forever
There is no per-conversion server cost, so there is no paywall, no usage limit, and no premium tier. Every document tool on FileShrink is fully functional for everyone.
Frequently asked questions
- Do my documents get uploaded to a server?
- No. The document converters run inside your browser using pdf-lib (for creating and modifying PDFs) and pdfjs (for rendering PDF pages). Both libraries are loaded on-demand from the same origin, no third-party service is involved, and no file ever leaves your device.
- Can I convert a multi-page PDF to images?
- Today the PDF-to-image tools extract the first page. Extracting every page as a separate image (or as a zip of images) is on the roadmap and will ship as a dedicated tool when ready.
- Will converting an image to PDF change its quality?
- No. The image-to-PDF tools embed your JPG or PNG bytes directly into the PDF without re-compressing them. What you put in is exactly what the PDF contains — the only overhead is a few hundred bytes of PDF structure.
- What about scanning, OCR, or text extraction from PDFs?
- Those are separate tools that we may add later. The current converters only handle format transformation — they do not read or extract text content from PDFs.
- How big can my document be?
- The only limit is your device’s available memory. Modern laptops handle 100+ MB PDFs without issue. Mobile devices may struggle above 30 to 50 MB because of stricter memory caps in mobile browsers.