Convert Image to WebP, JPG or PNG Online – Free Image Format Converter

Convert image formats without losing control of quality

Sooner or later a picture is in the wrong format. A website wants WebP, a job portal accepts only JPG, a design needs a PNG, and the photo you have is none of them. This page is a free image converter that moves a picture between JPG, PNG and WebP in whichever direction you need, and does it on your own device.

You can convert one image or a whole batch, change the quality, shrink the width on the way, and cap the file size if something has asked you for a specific number. The size cap is optional and switched off by default, because it is the cap, not the conversion, that makes pictures look soft.

How to change a photo's format online, step by step

1. 1
   Drop your pictures onto the box that says "Drop files here, or click to browse", or click it and choose them. Select as many as you like.
2. 2
   Under Convert to, choose JPG, PNG or WebP.
3. 3
   Set Quality between 10 and 100. It starts at 92, which keeps detail. It has no effect when the output is PNG.
4. 4
   If the pictures are bigger than you need, type a number in Max width in px. Leave it at 0 to keep the original width.
5. 5
   Leave Size limit at 0 unless someone gave you a figure. If they did, type it and pick KB or MB under Limit unit.
6. 6
   Press Convert Images. Each result shows a thumbnail, a Download link and a note with the old and new size. With several results, use the ZIP button to take them all at once.

JPG, PNG or WebP: which format fits the job

The three formats solve different problems, and choosing the right one matters more than any setting.

As a rule, use WebP for pages you publish yourself and JPG for anything you hand to another person or an upload form. WebP often produces a smaller file than JPG at similar visual quality, but a form that lists "JPG" will not take it, so the convenient choice and the accepted choice are not always the same.

What happens to your picture during conversion

The conversion uses your browser's own image engine and a canvas, the same drawing surface web pages use. Your picture is opened, drawn onto a white canvas at the final size, and encoded again in the format you picked. Because the picture is redrawn, details stored beside the pixels, such as camera model and location tags, are not carried across.

The white background is worth remembering. A transparent area in a PNG or WebP is filled with white before encoding, whatever the output format. A logo with a see-through background will therefore come out on a white rectangle, even if you convert PNG to PNG. If you need transparency kept, this tool is not the right one.

Quality works the way it does in any editor: lower numbers give smaller files and visible artefacts, and higher numbers give larger, cleaner files. Converting a picture to the format it is already in still re-encodes it, so avoid doing that unless you want the resize or the size cap.

What the size limit does, and why it is off by default

If you set a limit, the tool first encodes at your chosen quality. When the result is over the limit, it lowers the quality in steps of 0.07 until the file fits or the quality reaches about 0.2. A quality of 0.92, for instance, passes through 0.85, 0.78, 0.71, 0.64, 0.57, 0.5, 0.43, 0.36, 0.29 and 0.22.

If the file is still too large, it begins shrinking the pixels. Each step scales the width and height by 0.82, up to six times, re-encoding at quality 0.8 each time, and it stops as soon as the file fits. PNG cannot trade quality for size, so for a PNG the tool goes straight to shrinking the pixels.

This is why a limit costs detail and a plain conversion does not. When the limit cannot be reached the note says so, and gives you the closest result.

A worked example: a phone photo for a website

Take a 4000 by 3000 pixel JPG from a phone, which holds 12,000,000 pixels. You want a WebP for a blog post that is no wider than 1600 pixels. Set Convert to WebP, Quality 80 and Max width 1600.

The new height is 3000 multiplied by 1600 divided by 4000, which is 1200, so the output is 1600 by 1200 pixels. That is 1,920,000 pixels, a little over a sixth of the original (12,000,000 divided by 1,920,000 is 6.25). The note under the result shows the old and new file sizes together with "1600×1200, full quality", which here means no size limit was applied.

Now suppose the site also insists on 300 KB at most. Type 300 with KB selected. The tool works with 307,200 bytes (300 times 1,024). If the 1600-pixel WebP at quality 80 is already under that, nothing more happens. If not, it steps the quality down as described, and only if that fails does it begin to shrink the width.

Reading the result note

Each result carries a short note. Without a limit it looks like "3200 KB → 410 KB · 1600×1200, full quality". With a limit it ends in "within limit" or in a plain statement that the limit could not be reached without losing too much detail.

One more message is worth knowing. Not every browser can write every format, and a browser that cannot encode WebP may quietly produce PNG data instead. The tool detects that, names the file after what was actually produced, and tells you that the browser could not write the format you asked for, so you never end up with PNG data in a file called .webp.

Everyday uses

• Turning WebP downloads into JPG so a job or exam portal will take them.
• Making PNG screenshots smaller by saving them as JPG or WebP when transparency is not needed.
• Preparing blog and product images as WebP to help pages load faster.
• Reducing a batch of holiday or event photos to a sensible width before sharing them.
• Getting a picture ready for the next step: images into a PDF, or the JPGs in particular with a JPG-only route.
• Converting a signature scan to PNG for a document template.

Practical tips

Convert from the best source you have. A JPG that has been through a messaging app is already degraded, and converting it again cannot restore anything. Go back to the original camera file if it exists.

For photographs, 85 to 92 is a comfortable range. Below about 70 the artefacts start to show on skin and sky. For screenshots with text, prefer PNG, which keeps edges clean.

Resize and convert in the same pass. Choosing a Max width here is better than converting first and shrinking later, because you encode once instead of twice. A width only ever reduces a picture: an image already narrower than the number you type is left alone.

When a form wants an exact number of pixels as well as a file size, use the exam form presets. When it only gives a KB limit, resize to KB gives you the same stepping with extras such as a minimum size.

Converting a whole folder of pictures at once

Batch work is where an online converter earns its place. Add fifty photographs, choose the format once, and every picture is converted with the same settings. The tool processes several at a time instead of strictly one after another, which shortens the wait, and the results still appear in the order you added them.

Each output keeps the original name with the new extension, so holiday.png becomes holiday.jpg. When more than one file comes back, the ZIP button packs them into a single download. The archive is stored rather than squeezed again, since pictures are already compressed and deflating them would only add waiting time.

A sensible routine for a large batch is to run one or two pictures first. Check the size note and look at the thumbnail, then add the rest with the same settings. That catches a wrong quality or width before it has been applied fifty times.

Choosing a format for where the picture is going

• Your own website or blog: WebP, quality 75 to 85, width no larger than the widest place the picture is displayed.
• Job, exam or government upload forms: JPG unless the instructions say otherwise, because it is the format they nearly always list.
• Messaging apps and email: JPG at 80 to 90, with a Max width of 1600 or so if the original is a full-resolution camera file.
• Presentations and documents with sharp lines, charts or text: PNG.
• Printing: keep the original camera file and convert only a copy, since any conversion here is a re-encode.

Common mistakes

• Renaming photo.webp to photo.jpg. That changes the label and not the contents, and many portals check the contents. Convert it properly.
• Converting JPG to PNG to "improve quality". PNG preserves what is there and will not add detail. The file will simply be bigger.
• Setting a size limit when you only wanted another format. Leave it at 0.
• Expecting transparency to survive. It is flattened to white.
• Converting back and forth between lossy formats. Each trip loses a little.

Limits and what the tool cannot read or write

The output is limited to JPG, PNG and WebP, because those are the formats a browser can write. AVIF, BMP, TIFF and GIF cannot be produced. Input depends on the browser: anything it can open will work, and if it cannot open a file you see a message saying it is not an image the browser can open. An animated picture comes out as a single still image.

There is no separate cap on the number of pictures. Very large images and big batches are limited by your device's memory, and the tool works through several at once while keeping the results in the order you added them. If two inputs share a name and end up in the same format, take care to rename or download them one at a time.

Private by design

Your images are opened and converted in your browser tab and are not uploaded to a Jobsixo server. There is no account, no watermark, and no limit on how many times you convert.

Related tools

To go the other way from a document, export pages as JPG. To gather phone photographs into a single document, you can also make one PDF straight from the camera shots.