PDF to WebP

WebP files are usually the smallest of the three image exports PDFChamp offers for the same page, though the exact margin depends on the page and on your browser's encoder. Flat business documents — text, tables, line rules — are where WebP's advantage is largest, because it handles broad areas of uniform colour better than JPEG's block transform does. Photographic pages narrow the gap considerably. Against PDF to PNG the difference is dramatic, since lossless encoding cannot discard anything at all. The honest way to decide is to export one representative page from this tool and from PDF to JPG at the same DPI and quality, then compare the two files on disk — the encoders belong to your browser, so results shift between Chrome, Firefox and Safari.

WebP opens natively in every current browser and in the image viewers built into recent Windows, macOS, Android and iOS releases, so for anything web-facing it is safe. Where it still trips people up is older desktop software: some long-lived design suites, corporate document systems, print workflows and email clients either refuse the format or render it as a broken placeholder. If the image is going into a print job, an office template, or an attachment for a recipient whose software you do not control, export from PDF to JPG instead — JPEG remains the universal fallback. WebP is the better answer when you own the destination, which covers websites, apps and modern content systems.

Transparency survives when the page has any, because this exporter does not paint a white background onto the canvas before rendering — unlike PDF to JPG, which must, since JPEG cannot store an alpha channel. WebP can store one, so unpainted regions of a page come through transparent. Whether your page actually has unpainted regions is up to whoever authored the PDF; most office and print documents draw a solid white page box, and those export as solid white no matter which tool you use. If you need transparency you can rely on, PDF to PNG is the more predictable choice, because lossless encoding will not introduce fringing around the edges of a cut-out shape.

The Quality slider hands a value between 0.5 and 1.0 to your browser's WebP encoder, starting at 90 %, and it changes compression only — the DPI chips are what change resolution. WebP's lossy mode degrades differently from JPEG: instead of blocky artefacts it tends to smear fine detail and soften the edges of small type, so a page of 8-point footnotes suffers earlier than a page of headings. For screen-sized exports 80–90 % is usually indistinguishable from the original, while below 60 % thin strokes start to break up. Setting the slider to 100 % does not make the export lossless — WebP's lossless mode is a separate encoding path that the browser canvas API does not expose.

Every page becomes its own WebP file; there is no zip bundling and no option to tile the pages into one tall image. A multi-page run fires the saves in sequence with a short delay between them, so browsers that throttle rapid downloads have time to ask whether to allow multiple files from the site — say yes at the first prompt, or only page one arrives. Filenames follow the source document with a zero-padded page number, which keeps them in order in any file manager. If you only want one page, isolate it first with Extract PDF pages and run the single-page result through here, which also saves rendering pages you do not need.

Nothing about your document reaches PDFChamp — no file, no filename, no page count. The conversion is three local steps: the File API hands your PDF's bytes to pdf.js inside the page, pdf.js paints each page onto a canvas element, and the canvas encodes WebP bytes that go straight into a download. There is no upload endpoint in the tool that could receive anything. It is free with no account, and it adds no watermark or branding to the images. The only network traffic a conversion causes is the one-time fetch of the pdf.js worker script the first time you convert in a session, which is code coming to you rather than data leaving you.