Convert PDF to JPG in your browser with full quality control. Each page renders to a JPEG image at your chosen DPI (72 / 150 / 300), with adjustable JPEG quality from 50–95. Multi-page PDFs batch-export as a ZIP archive. Nothing is uploaded — your PDF never leaves your machine. This guide explains the rendering pipeline, when JPG wins over PNG, and how the result compares to iLovePDF, Smallpdf, and Adobe's online converter.

How PDF to JPG conversion works

A PDF's vector page description is rasterized into a pixel grid by a PDF rendering engine (PDF.js in this case), then encoded as JPEG using the standard DCT (Discrete Cosine Transform) algorithm. Three steps happen on every page:

1. Vector interpretation. The PDF's content stream is parsed into drawing commands — glyphs, paths, gradients, images — each with positioning information and an embedded or referenced font. PDF.js does this in your browser tab using a WebAssembly-compiled rendering engine.

2. Rasterization. Each command is rendered against a backing canvas at the chosen DPI. The output is a rectangular pixel buffer — typically RGBA — representing the rendered page as it would appear on screen or in print.

3. JPEG encoding. The pixel buffer is re-encoded with the JPEG lossy compression algorithm. At quality 85 (the default for most tools), the JPEG is roughly 5–10× smaller than an equivalent PNG, with imperceptible visual loss on text-heavy pages. Transparent regions are flattened against a white background before encoding — JPEG has no alpha channel, so any PNG-style transparency becomes an opaque pixel.

Privacy by default. All three steps run in your browser's JavaScript runtime via PDF.js. There is no upload step. There is no analytics endpoint behind the UI. Close the browser tab and the bytes are gone.

When JPG beats PNG (and when it doesn't)

Choose JPG when:

• The PDF page is a photograph, scanned document, or full-page illustration.
• You need a smaller file at the cost of some quality.
• The downstream consumer is a social platform or email (both prefer JPG).
• The page has minimal fine text or line art.

Choose PNG when:

• The page contains small text (8–10 point) or hairline rules.
• You need flat-color fidelity for line art, diagrams, or charts.
• The viewer will zoom in significantly (1:1 pixel inspection).
• Transparency matters for compositing over other backgrounds.

For a 10-page PDF with mostly text and one image per page, JPG usually wins: ~5× smaller files, no visible loss on the text-heavy pages, slight artifacts only on the photo pages. For a 10-page infographic or wireframe-heavy PDF, PNG is the better pick.

Quality vs. file size trade-off

JPEG quality settings from 50 to 95 give you a direct knob:

For most use cases, Quality 85 is the sweet spot. Drop to 70 if you need to halve the file size; raise to 95 only when the page contains photos that will be displayed at large scale.

Common resolutions and what they're good for

At 150 DPI, most PDFs render close to their "natural" size — text is legible on a typical screen, and the file sizes are easy on email clients. The browser tool defaults to 150 DPI as a balanced choice.

Privacy, security, and the in-browser guarantee

Three concrete facts about how this tool handles your files:

1. Zero upload. Unlike iLovePDF, Smallpdf, or Adobe's online PDF to JPG, this workflow does not transmit your PDF to any server. The browser fetches the JS bundle once, then everything runs against File objects held in memory.

2. Zero log. No server sees your filename, your content, or your quality choices. There is no analytics endpoint behind the UI. The page can be used offline once loaded.

3. Zero persistence. The output JPEGs live only in your browser's memory and as Blob URLs for the download buttons. Closing the tab reclaims everything.

This is why in-browser PDF converters matter for confidential documents — HR records, scanned medical forms, legal filings, financial reports. When the file never leaves your device, the attack surface shrinks to "someone with physical access to your laptop", which is the surface you already defend with disk encryption and screen lock.

How this compares to the well-known alternatives

Honest comparison against the three most-cited competitors (correct as of July 2026). Numbers are observed averages on a 10-page mixed-content PDF at 150 DPI; your mileage will vary.

The "Files uploaded?" column matters most. For scanned identity documents, financials, or any sensitive content, this is the deciding factor. Server-based tools require a contractual trust assumption: you're trusting their deletion policy. Our tool removes that assumption.