PDF to JPG vs PDF to PNG: Which Should You Choose?

You need to drop a single page of a PDF into a slide deck, a wiki, a Jira ticket, or a Slack message. Every modern tool offers two options: PDF to JPG and PDF to PNG. They sound interchangeable. They are not. Pick wrong and you'll either ship a slide deck with razor-sharp screenshots that take 80 MB to email, or one with hairline-blurry text that your CEO will absolutely notice from the back of the room.

This guide gives you the decision in 10 seconds (TL;DR below), then explains why the rule works, and walks through both Ai2Done's PDF to JPG converter and the upcoming PDF to PNG export at /tools/pdf_to_png. Both run 100% in your browser via WebAssembly — your PDFs never leave your device.

TL;DR — The 10-second decision

Why this is harder than it looks

JPG and PNG are not "lossy vs lossless" in the casual sense everyone repeats. They differ in what kind of image they're optimised for.

JPG uses the Discrete Cosine Transform (DCT) and was designed in 1992 specifically for continuous-tone natural images — photographs of real-world scenes where adjacent pixels usually have similar colors. Its compression silently throws away information in 8×8 pixel blocks where the human eye is bad at noticing. Drop a portrait into JPG and a 10 MB file becomes 800 KB with no perceivable loss. Drop a black-and-white line drawing into the same format and you get those notorious "JPG halos" around every stroke — the algorithm fights against sharp transitions because it was never built for them.

PNG uses DEFLATE compression on the raw pixel grid and was designed in 1996 specifically for screenshots, diagrams, logos, and any image with hard edges or limited color palettes. It's lossless, which is wonderful for diagrams and terrible for photos — a photo saved as PNG can easily be 5-10× larger than the equivalent JPG.

A PDF page is rarely "just text" or "just a photo." Most PDFs contain both, plus tables, charts, and vector graphics that the renderer has to rasterise. The format you choose determines which type of content survives the conversion cleanly and which gets visibly mangled.

Method 1: Ai2Done PDF to JPG (for photo-heavy pages)

Use Ai2Done's PDF to JPG converter when your PDF page is dominated by photographic content: marketing brochures, real estate listings, photo essays, food menus, art catalogs. The flow:

1. Open /tools/pdf_to_jpg in your browser.
2. Drop your PDF — preview thumbnails appear within ~2 seconds for files up to a few hundred MB.
3. Pick DPI: 96 for on-screen sharing, 150 for embedded slide use, 300 for print-bound output.
4. Choose JPG quality: 90 is the universal sweet spot. Lower to 75 only if you must email a large batch over a small attachment limit.
5. Convert and download — one JPG per page, or a ZIP for multi-page PDFs.

The conversion is done entirely in your browser using pdf.js for page rendering plus mozjpeg-wasm for JPG encoding. The original PDF never touches a server. A 50-page PDF at 150 DPI takes ~15 seconds on a 2022 laptop.

When JPG wins: file size. A photo-heavy page at quality 90 typically lands at 200-400 KB. The equivalent PNG of the same page is often 3-5× that. If you're emailing a 30-page brochure, JPG output produces a manageable attachment; PNG produces something Gmail will block at the door.

Method 2: PDF to PNG (for text/diagrams)

Use the PDF to PNG converter when your PDF page is dominated by text, line diagrams, technical drawings, screenshots of UI, or anything with hard edges and sharp boundaries: legal contracts, engineering blueprints, financial tables, code listings, flowcharts.

The workflow is identical to the JPG converter — drop file, pick DPI, click Convert — but the output is a lossless PNG. No "quality" slider because PNG is lossless by definition; the only knob is resolution.

When PNG wins: text legibility at small zoom. Open a PDF page in a slide deck thumbnail or a Confluence preview at 30% zoom, and JPG text looks subtly fuzzy — a kind of softness that's hard to point at but obviously wrong. The same page exported as PNG stays razor-sharp because there's no DCT smearing happening at glyph boundaries.

PNG also handles transparency, which JPG cannot. If you're extracting a logo or diagram and want it to drop cleanly onto a colored background later, PNG is the only valid choice.

Method 3: When the page is mixed

The honest answer for most real-world PDFs: pick the format your dominant content needs, then accept the trade-off for the other 30%.

A 20-page sales report with photos and text? Export as PNG at 150 DPI. The photos will be perfectly readable on screen (you're zooming to fit a slide, not pixel-peeping a print), and the text — which is what your reader actually looks at — stays crisp.

A 5-page wedding photo album? Export as JPG quality 95. The body text on each page (captions, dates) is short and large; JPG will render it acceptably, and the photos save 80% on file size compared to PNG.

A 200-page technical manual with screenshots? Export as PNG. The file size will be larger, but if you're inserting it as a wiki attachment or archiving it, total bytes matters less than text clarity.

How we built both converters (technical deep-dive)

Both the PDF to JPG and PDF to PNG tools share the same pipeline:

1. Page rendering uses pdf.js (Mozilla's PDF renderer, the same one Firefox ships) compiled with WebAssembly acceleration. Each page is rendered to an offscreen <canvas> at the chosen DPI.
2. Pixel extraction uses the canvas getImageData() API to pull a raw Uint8ClampedArray of RGBA values.
3. Encoding diverges: PNG uses pako (a JavaScript DEFLATE port) wrapped in a minimal PNG header writer; JPG uses mozjpeg-wasm which delivers ~10% better compression than libjpeg-turbo at the same visual quality.
4. Batching uses Web Workers so the UI stays responsive while a 100-page PDF crunches in the background.

The reason both run in-browser rather than server-side is the same reason all our PDF tools work this way: PDFs often contain confidential information (contracts, medical records, financial statements), and the safest possible posture is "the bytes never leave your machine, period."

The one technical quirk worth knowing: PDF pages with very high embedded image resolution (some marketing PDFs have 600+ DPI photos baked in) can produce huge intermediate canvases. We cap rendering at 300 DPI by default to keep RAM usage sane on Chromebooks and older phones.

FAQ

Q: Does the converter preserve text as text, so I can search it later? A: No — both JPG and PNG are raster formats. They contain pixels, not text. If you want searchable text from a PDF, use the Extract Text tool or PDF to Word instead. Both run client-side.

Q: What about WebP? Isn't it better than both? A: For modern web use (Chrome, Edge, Firefox, Safari 14+), WebP genuinely is better — smaller files at the same quality. We're adding WebP export in 2026 Q3. Until then, JPG remains the universal compatibility choice; PNG is the universal lossless choice.

Q: My PDF has 500 pages. Will the converter handle it? A: Yes, but in two ways. For PNG export of huge PDFs, peak memory can exceed 2 GB if you process all pages at once. The tool will warn you and suggest splitting the PDF first with our Split PDF tool. For JPG export, this is less of an issue because JPG encoding releases memory as each page finishes.

Q: Will the output be 100% identical to what I see in Adobe Acrobat? A: 99.5% identical. There's a tiny class of rare PDF features (some obscure transparency blend modes, certain Type 3 embedded fonts) where pdf.js renders very slightly differently from Acrobat's commercial renderer. For everyday PDFs this is invisible.

Q: How do I do PDF to PNG with transparent backgrounds? A: Toggle "Transparent background" in the PNG converter settings. The white page background is replaced with full transparency, which is what you want when extracting a diagram or logo for later compositing.

Q: Is there a per-page quality preview before I commit? A: Yes. After uploading, click any thumbnail to see a side-by-side preview of "original vs converted at current settings." Adjust DPI or quality and re-preview without burning your full conversion quota.

Try it now

• Photo-heavy PDF? → PDF to JPG converter
• Text/diagram PDF? → PDF to PNG converter
• Need to extract just the words instead? → Extract Text

All run in your browser. No upload, no signup, no watermark.

Related reading

• HEIC to JPG conversion: the right way on every device — same JPG-vs-modern-format decision, applied to phone photos
• How to compress PDF without losing quality — when you need to shrink the source PDF before converting
• Image compression for the web — for after you have your JPGs
• Browse all PDF tools and image tools

Last updated 2026-06-14. PDF to JPG and PDF to PNG both run 100% in your browser — your PDFs never leave your device. We never collect, log, or analyse the files you process.