PDF to JPEG Converter

What the page does

It turns PDF pages into JPEG images with a .jpeg extension. PDF.js draws each page to a canvas at the size you specify, the canvas is encoded as JPEG at the quality you specify, and the result is offered as a download. Everything runs locally in the browser.

JFIF and JIFF appear elsewhere in this tool family for legacy naming; this page is the straightforward JPEG path with the long-form extension, which is the one enterprise document systems, Office workflows and MIME-based pipelines tend to expect.

How JPEG spends its bits

Understanding the trade makes the quality slider less mysterious. JPEG divides the page into 8×8 pixel blocks, converts each block into frequency information, and discards the high-frequency detail that the eye notices least. It also stores colour at lower resolution than brightness, because human vision is more sensitive to luminance than to hue.

That design suits photographs, which are full of soft gradients. It works against hard-edged graphics. A letterform is mostly high-frequency information, so the encoder has to choose between preserving the edge and saving bytes. At high quality it keeps the edge and the file grows; at low quality it blurs the edge and surrounds it with faint ripples. Those ripples are the "ringing" you see around small type in an over-compressed scan.

The colour reduction is usually invisible on a photo and occasionally visible on saturated flat graphics: a bright red logo can shift slightly at low quality because its chroma is stored coarsely. If exact colour matters, PNG is the correct output, not a higher JPEG quality.

Choosing a quality value

The default of 90 is a reasonable middle. Moving from 90 to 100 typically increases size substantially for a difference most people cannot see. Moving from 90 to 70 halves the size and starts to cost legibility on text.

Scale, pixels and print size

At 100 percent, an A4 page renders at roughly 794 by 1123 pixels, which is the page size in CSS pixels. At 200 percent it becomes about 1588 by 2246 pixels, which is around 300 DPI at A4 — the usual threshold for a decent desktop print. At 300 percent you reach roughly 2380 by 3370 pixels, enough for a large-format reproduction or for cropping.

Pixel dimensions are not the same as print resolution, though. The exported file does not contain a DPI tag, so a print dialog will assume 72 or 96 DPI and propose a page much larger than intended unless you set the size manually. If a print workflow requires embedded resolution metadata, this output will disappoint regardless of pixel count.

Why the .jpeg extension

The extension is cosmetic to browsers and meaningful to scripts. Systems that route files by suffix — document management platforms, scanner intake folders, print queues, some content management uploads — may be configured for the four-letter form because it matches the MIME subtype image/jpeg. Others accept only the three-letter .jpg. The JPG page of this tool exists for that case, and the two produce identical image data at identical settings.

If a portal rejects the upload without explanation, check its documented extension list before assuming the file is corrupt. Renaming a .jpeg to .jpg changes nothing about the image.

Step by step

1. Load a PDF. The uploader accepts anything detected as PDF by type or extension.
2. Check that the format selector reads JPEG; it defaults to that on this page but lists all supported outputs.
3. Enter a quality percentage between 1 and 100 and a scale between 5 and 300.
4. Press Render Pages. The button disables while the loop runs, and a status line names the page being encoded.
5. Inspect the thumbnails. This mode previews the actual JPEG, so soft edges or banding visible here will be in the download.
6. Select one page, a range, or everything, then download individually or as a ZIP.

Naming follows the PDF: invoice-page-3.jpeg, and the archive is invoice-selected-pages.zip. Unsupported characters in the source name become hyphens; the extension is always lowercase.

Where JPEG wins and where it loses

It wins on photographs, scans, brochure pages and anything with continuous tone, where its size advantage over PNG can be five to ten times. It also wins wherever a system demands a JPEG.

It loses on pages dominated by text, line art, screenshots, UI mockups and charts. There PNG is both sharper and often smaller, because lossless compression of large flat areas beats JPEG's block encoding. It also loses whenever transparency matters, since JPEG has no alpha channel and must flatten it to a solid colour.

For a mixed document, there is no rule that says every page needs the same format. Render once as JPEG for the photo-heavy pages and once as PNG for the text-heavy ones; the page selector makes it easy to keep only what you need.

Repeated conversion

Every JPEG encode is lossy. Converting a PDF page to JPEG, editing it, and saving again compounds the loss. The same applies to running the converter twice on its own output: the second pass re-encodes an already quantised image. Keep the PDF as the master and regenerate from it whenever you need a different size or quality.

Screenshots of JPEGs are a common hidden second generation. A screenshot re-samples the displayed image, which is usually already scaled by the viewer, so detail is lost twice.

Limits

One PDF per run, all pages rendered, one still image per page, no animation, no transparency, no selectable text, no OCR, no embedded colour profile, no DPI metadata and no control over chroma subsampling or progressive encoding. Password-protected files will not open. There is no page-range render, no multi-document queue and no automatic rotation. Browser memory is the practical ceiling for very large pages at high scale.

Privacy

This format is processed entirely in the browser: the PDF is read locally, the JPEG is encoded on a canvas, and the download comes from a local blob. No part of the document is uploaded. That makes it suitable for confidential pages, subject to the usual care with the files you save afterwards.

Common mistakes

• Using maximum quality for everything. It multiplies size for a gain below the visible threshold.
• Converting text pages to JPEG out of habit. PNG is sharper and often smaller.
• Expecting transparency. JPEG cannot store it; flat areas are filled.
• Assuming the pixel size sets the print size. Without a DPI tag, print dialogs guess.
• Re-saving the JPEG repeatedly. Each pass degrades the image.
• Blaming the file when a site rejects .jpeg. The site is checking the suffix; rename it.

Frequently Asked Questions