JPEG Image Converter – Convert JEPG to PNG, WebP, AVIF, ICO & More
About the JPEG Image Converter
This JPEG Image Converter takes a JPG or JPEG file up to 10MB and re-encodes it into any of seven output formats: PNG, WebP, AVIF, JPG, GIF, ICO, or TIFF. Conversion happens entirely inside your browser using the HTML canvas API, so the image is never uploaded to a server — it is read locally, redrawn, encoded, and handed straight back to you as a download.
Each format serves a different purpose, and the buttons are labeled accordingly. PNG is lossless and best when you need a clean master copy. WebP and AVIF are modern compressed formats that usually produce far smaller files at the same visual quality, which is why they are the standard choice for web delivery. JPG lets you recompress an existing JPEG at a lower quality setting. GIF, ICO, and TIFF cover legacy embedding, favicons, and print workflows respectively.
Browser capability is detected automatically when the page loads. If your browser cannot encode a particular format — AVIF support in particular varies between browsers and versions — that button is disabled rather than silently producing a broken file, so you always know what your machine can actually output.
A quality slider from 1 to 100 appears only for the lossy formats where it has an effect, and resizing supports original size, 25%, 50%, 200%, or exact custom pixel dimensions with an aspect ratio lock. If you are targeting a specific shape rather than a specific pixel count, the Aspect Ratio Calculator works out the second dimension before you enter it here.
After every conversion, a side-by-side preview shows the original and the result over a transparency checkerboard, backed by four statistics: original size, converted size, percentage size change in green or red, and final dimensions. That change figure is the honest one — converting a photographic JPEG to PNG will often produce a much larger file, and the tool shows you that rather than assuming every conversion is a saving.
Everything here was checked in-house by the BigToolSite Team, who ran conversions across all seven formats, confirmed the ICO byte header produces a valid Windows icon, and verified the aspect ratio lock stays accurate when typing into either dimension field.
If you are still deciding what the output should be rather than how to produce it, the JPG to Image Converter walks through which format suits web delivery, print, and favicons.
How to Use the JPEG Image Converter
- Drag a JPEG onto the upload area or click it to browse. Only .jpg and .jpeg files are accepted, with a 10MB ceiling — anything else returns a clear error message instead of failing silently.
- Check the file card that appears, showing a thumbnail, filename, file size, and pixel dimensions. Use Remove to swap in a different image.
- Pick an Output Format from the seven buttons. Any format your browser cannot encode will already be disabled.
- Set the Quality slider if you chose JPG, WebP, or AVIF. It defaults to 85%, a good balance between file size and visible artifacts, and stays hidden for lossless formats where it does nothing.
- Choose a Resize option: Original Size, 25%, 50%, 200%, or Custom Size. Custom reveals width and height fields with Maintain aspect ratio enabled, so typing one dimension fills in the other automatically.
- If you selected ICO, use the ICO Size dropdown to pick 16, 32, 48, 64, 128, or 256 pixels. Icons are always square, so this setting replaces the resize options.
- Click Convert & Download. A progress bar tracks the rendering and encoding stages, the file downloads automatically as yourfilename-converted.ext, and the preview and statistics appear below.
- Use Reset to clear the image and start over with a new file.
Example Usage
Input: photo.jpg, 2400×1600, 3.2 MB. Format WebP, Quality 80, Resize 50%.
Output: photo-converted.webp at 1200×800, roughly 180 KB — a size change of about −94%, shown in green. This is the standard recipe for preparing a hero image for a web page: halve the dimensions and switch to a modern codec in one pass.
Input: logo.jpg, 512×512. Format ICO, ICO Size 32×32.
Output: logo-converted.ico, a 32×32 icon file ready to drop into your site root as favicon.ico. The converter writes a proper ICO header around PNG image data, which is the format modern browsers expect.
Input: scan.jpg, 3000×2000. Format TIFF, Resize Original Size.
Output: scan-converted.tiff, an uncompressed file suited to print and archival use. TIFF output is large by design, and the statistics panel will show a positive size change in red to reflect that. Before sending anything to a printer, the DPI/PPI Calculator confirms whether your pixel dimensions are high enough for the physical size you need.
When you are batching several images for a page, the combined weight matters more than any single file. The File Size Calculator adds up the converted sizes and estimates the transfer time your visitors will experience.
Frequently Asked Questions
No. The file is read by your browser, drawn to a canvas element, encoded, and returned as a download. Nothing is transmitted, which is why conversion speed depends on your own device rather than a network connection.
PNG is lossless and stores every pixel exactly, while JPEG discards detail to save space. Converting a photograph from JPEG to PNG therefore adds size without adding quality. Choose PNG when you need an editable master, and WebP or AVIF when you want a smaller file.
No. Compression artifacts baked into the JPEG are permanent, and PNG simply preserves them faithfully. No format conversion can recover detail that was already discarded.
Your browser cannot encode AVIF. The tool tests canvas encoding support on load and disables any format that would fail, so you never download a broken file. Trying a current version of Chrome, Edge, or Firefox usually resolves it.
WebP is the safest modern default, with broad browser support and significantly smaller files than JPEG at matching quality. AVIF compresses even further and suits large hero images, while PNG is best reserved for graphics with sharp edges or flat color rather than photographs.
The 85% default suits most photos. Between 75 and 85 the difference is rarely visible at normal viewing size while the savings are substantial. Below about 60, blocking and color banding start to show, especially in skies and gradients.
Icon files must be square and sized to standard values, so the ICO Size dropdown takes over from the general resize options. Pick 16 or 32 pixels for a browser favicon, and 128 or 256 for desktop and high-density displays.
No. A source JPEG is always a single still frame, so the GIF output contains one frame. The GIF option is useful for legacy embedding rather than animation, and it fills transparent areas with white since GIF handles transparency poorly.
Yes, it’s completely free with no signup required.
