QuickMergeImage Converter — JPG, PNG and WebP
Short answer: To convert an image between JPG, PNG and WebP, choose the target format and export a new copy. QuickMerge makes the conversion locally in your browser without uploading the image.
Convert images between JPG, PNG and WebP with an adjustable quality setting, entirely in your browser. PNG to WebP, JPG to PNG, WebP compression and back again — no upload, no account, and the picture never leaves your device.
How do I convert an image between JPG, PNG and WebP?
Drag & drop here
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Convert Between JPG, PNG, and WebP
Different jobs want different image formats: JPG for small photos, PNG for sharp graphics and transparency, WebP for the best size-to-quality ratio on the modern web. This tool converts any image to the format you need — PNG to JPG, JPG to WebP, and every other combination — with a quality slider for the lossy formats.
Conversion runs on a canvas in your browser. Everything runs on your device via open-source browser libraries — your file is never uploaded. You can verify it yourself.
Next steps
Related tools
- convert iPhone HEIC photos — a separate format that needs its own decoder.
- turn HEIC photos into a PDF — when the result should be a document rather than image files.
- rename JFIF files losslessly — no re-encoding needed for those.
What to do with the result
- compress the converted file — PNG output in particular is often large.
- strip EXIF from the result — conversion can carry metadata across.
Browse all image tools, or see every QuickMerge tool.
Wondering how big a file this can take? We measured it: see Image converter on the measured limits page, or the browser support matrix.
Frequently Asked Questions
JPG for photographs, PNG when you need crisp edges or transparency, and WebP when you want the smallest file at good quality (great for websites).
For JPG and WebP it trades file size against fidelity — lower means smaller. PNG is lossless, so the slider does not affect it.
Converting a transparent PNG to JPG fills the background white (JPG has no transparency). Convert to WebP or keep PNG to preserve transparency.
No — the conversion happens entirely in your browser and the image is never sent anywhere.
Once, at the moment of conversion, because JPG is lossy. The drop is usually invisible on photographs at high quality settings and clearly visible on screenshots or text, where PNG is the better format to stay in.
Almost always JPG to PNG on a photograph. PNG stores every pixel exactly, so a photo that compressed well as JPG expands considerably. Convert photographs toward JPG or WebP, not away from them.
Yes — JPG has no transparency, so transparent areas are filled, normally with white. Use PNG or WebP whenever transparency has to survive.
The HEIC converter handles that format specifically, including the multi-image files iPhones sometimes produce.
Re-encoding drops most of it, but treat that as a side effect rather than a guarantee. When removing GPS and camera data is the actual goal, use the metadata remover.
Use the PDF to JPG tool — it renders each page to an image at a resolution you choose, which this page cannot do because a PDF has no pixels until something draws it. Pick around 150 DPI for viewing on screen and 300 DPI if the result is going to be printed.
Load the PNG above, choose WebP as the output and adjust the quality slider. Transparency is preserved. For images going onto a web page this is usually the single biggest file-size saving available, often halving the file with no visible difference.
Reduce the pixel dimensions first with the resizer — dimensions affect file size far more than the quality setting does — and only then lower quality. For a specific byte target, compress the image against it directly.
Yes. Load it and re-export as WebP at a lower quality setting. Because WebP is already efficient, the useful range is narrower than with JPG: below about 70 the artefacts become visible quickly on photographs.
Yes — JPG has no transparency, so transparent areas are filled, normally with white. Keep PNG or WebP as the target whenever transparency has to survive.
Image to PDF wraps one or several pictures into a document with a page size you choose. If the pictures are iPhone HEIC files, convert them to JPG first.
Choose the format from the job, not the filename
A conversion changes how pixels are stored; it cannot restore detail that was already discarded. Keep the original until you have checked the new file at 100% zoom.
Photographs → JPG or WebP
For camera images, start around 82–88 quality. JPG is the safest choice for older software and print shops. WebP is usually smaller for websites, but confirm the receiving system accepts it. Repeatedly converting JPG to JPG compounds compression artifacts, especially around text and high-contrast edges.
Logos and screenshots → PNG
PNG preserves exact edges and transparency, which makes it better for interface captures, diagrams and logos. It may be much larger than JPG for a detailed photograph. When converting transparency to JPG, QuickMerge places the image on an opaque background because JPG has no alpha channel.
Check before deleting
Compare dimensions, transparency, colour appearance and file size after conversion. Browser colour management can differ from professional prepress software, and uncommon embedded profiles may not survive a canvas export. Use a dedicated imaging application for archival or print-critical colour workflows.
Maintained by QuickMerge · Practical guidance reviewed 11 July 2026 · How we review tools
Which format to convert to, and what each one costs you
Converting between JPG, PNG and WebP is quick. Picking the wrong target is what causes the file to look worse or grow larger than the original.
JPG discards detail every save
JPG is lossy: it re-compresses on every save. It suits photographs, where the loss is hard to see, and is a poor choice for screenshots, diagrams or anything with sharp edges and flat colour, where it produces visible fringing around text and lines.
PNG is lossless and supports transparency
PNG keeps every pixel exactly and preserves transparent backgrounds. That makes it right for logos, screenshots and line art — and wrong for photographs, where it commonly produces a file several times larger than the JPG equivalent with no visible gain.
WebP is usually the smallest, with one caveat
WebP typically beats both at the same visual quality and supports transparency. Every current browser reads it. Some older desktop software and a few print workflows still do not, so if the file is going into someone else’s system rather than onto a web page, confirm they accept it first.
How to save a PDF as a JPEG, and why it is a different tool
A steady share of the traffic here is people trying to get a picture out of a PDF, or a PDF out of a picture. Neither is an image-format conversion, and using the wrong tool is why the result disappoints.
A PDF page has to be rendered, not converted
Converting JPG to PNG is a re-encode of the same pixel grid. A PDF holds instructions for drawing a page — text, vectors, embedded fonts — with no pixel grid at all until something draws one. Saving a PDF as a JPEG therefore means choosing a resolution and rendering, and the resolution is the whole quality decision: about 150 DPI for screen viewing, 300 for print. The PDF to JPG tool does that rendering and lets you set it.
Going the other way loses nothing but gains nothing either
Turning a PNG or JPG into a PDF just wraps the picture in a page. It is worth doing when a form insists on a PDF, when several images should arrive as one document, or when you want a fixed page size for printing — image to PDF handles it. It does not improve the image, and it does not make the text inside a photographed document selectable; that needs OCR.
Making a JPEG smaller is a quality decision, not a format one
Converting a JPG to another format rarely shrinks it usefully, and converting to PNG usually makes a photograph considerably larger. To reduce a file, either lower the quality setting during the export here, compress it against a target size, or reduce its pixel dimensions — which dominates file size far more than the compression setting does.
WebP compresses better, and is the one to convert to for the web
PNG to WebP is the most useful conversion on this page for anyone publishing images. WebP holds transparency like PNG and compresses like JPG or better, so a logo or a screenshot commonly halves in size with no visible change. Compressing an existing WebP further is a quality-slider operation rather than another format change.