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Convert PNG to JPG to Reduce File Size

Converting a PNG to JPG is the single most effective way to reduce image file size for photographs and continuous-tone imagery, far more impactful than any PNG optimisation tool can deliver on the same source content.

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60-85% file size reduction for photographs

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Quality slider to target any file size

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Preview before downloading

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Free with no upload limits

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Drop the Image Format Converter into any page — blog post, product docs, intranet, school portal — with a single line of HTML. Your visitors get the full tool, processed entirely in their browser. No backend, no uploads, no signup.

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  src="https://www.fixtools.io/image-tools/image-format-converter?embed=1"
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  style="border:0;border-radius:16px;max-width:900px;"
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  width="100%"
  height="780"
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  style="border:0;border-radius:16px;max-width:900px;"
  title="Image Format Converter by FixTools"
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Attribution-friendly: a small "Powered by FixTools" link appears in the embed footer.

How Much Smaller Will Your JPG Be? Quantifying PNG to JPG File Size Reduction

The file size reduction when converting PNG to JPG varies by image content, resolution, and quality setting. For photographs -- images with continuous colour variation, smooth gradients, and natural textures -- reductions of 75-90% are common. A 3000x2000 pixel photograph exported as PNG might be 6-8 MB. The same image as JPG at 90% quality might be 700 KB to 1.2 MB -- roughly an 85% reduction. At 85% quality, it might be 450-700 KB. At 80% quality, 300-500 KB. The relationship between quality and file size is not linear: the largest file size reductions happen when moving from 100% to 80%, with diminishing returns as you approach very low quality settings. The visible quality degradation curve runs in the opposite direction: most quality loss becomes perceptible below 80%, while quality above 80% is largely imperceptible for photographic content in normal viewing conditions.

For non-photographic PNG files -- screenshots, logos, flat-colour graphics, diagrams, and UI illustrations -- the file size reduction when converting to JPG is smaller and the quality trade-off is worse. A 1920x1080 screenshot PNG might be 800 KB and convert to 300 KB JPG at 90% -- a 62% reduction. But the same screenshot as JPG at 75% quality might show visible text blurring and block artifacts, reducing the usefulness of the file. Flat-colour graphics and vector-exported PNGs can also be tricky: their large areas of identical colour are handled efficiently by PNG lossless DEFLATE compression but create obvious blocking artifacts in JPEG at lower quality settings. For these image types, PNG often produces smaller files than a quality-preserving JPG would.

To predict how much file size reduction you will achieve before you actually run the conversion, a useful rule of thumb is: for photographs expect 75 to 85 percent reduction at quality 88 percent, for mixed content screenshots expect 55 to 70 percent reduction at quality 90 percent, and for flat graphics and logos expect 40 to 60 percent reduction at quality 90 percent but with some risk of visible artifacts in fine text or sharp colour transitions. The FixTools converter shows both original and output file sizes side by side in the preview pane before you commit to downloading, so you can test different quality settings and find the exact point where the file size target and visual quality both meet your requirements precisely. This feedback loop is the most reliable way to optimise the quality-versus-size trade-off for any specific image rather than guessing based on rules of thumb alone.

A practical workflow for reaching a specific file size target is to start at quality 88 percent as a default for most photographic content, check the output size against your target in the preview, and then adjust the slider up or down by 3 to 5 percentage points per iteration depending on which direction you need to move. Most photographs reach a 500 KB target somewhere between 80 and 90 percent quality, depending on the original resolution and content complexity. If you cannot reach your target size without dropping below 75 percent quality, the right move is usually to also resize the image to a smaller pixel dimension using the Image Resizer rather than continuing to lower quality, because aggressive downscaling combined with moderate compression produces a much better-looking result than mild downscaling combined with aggressive compression of the same data.

Image optimization for the web (web.dev)JPEG compression and quality (Wikipedia)PNG compression algorithm (Wikipedia)

How to use this tool

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Upload your PNG and start with quality 88%. Check the output file size shown in the preview. If the file is still larger than your target, reduce quality by 5 points and reconvert. For photographs, 80-88% typically hits email and upload size limits while keeping quality acceptable. For screenshots with text, stay above 88%.

How It Works

Step-by-step guide to convert png to jpg to reduce file size:

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Upload your PNG to FixTools
Open the FixTools Image Format Converter in your browser and upload your PNG using the drag-and-drop area or the file picker. The tool displays the original file size in bytes and megabytes as soon as the upload completes, which gives you a clear baseline to compare every subsequent conversion attempt against. Multiple files can be uploaded together if you are working on a batch with a shared file size target across the whole group.
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Select JPG output
Choose JPG as your target output format from the format selector panel. The selection persists for the rest of your browser session, so subsequent uploads default to the same output format without re-selection. JPG and JPEG are interchangeable extensions for the same underlying file format, so either choice produces an identical output file with the .jpg extension applied.
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Start at quality 88% for photographs
Set the quality slider to 88 percent as your starting point for photographic content. This setting is the recommended balance between file size reduction and visual quality for typical photographs and is also a defensible default for mixed-content images. For screenshots or graphics with sharp text, start at 90 percent instead and adjust from there based on the preview inspection.
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Check the output file size in the preview
The preview panel shows the converted file size alongside the original PNG size, making it easy to see your reduction at a glance. Compare the two numbers against your specific target size for the destination platform such as a CMS upload limit or an email attachment cap. If you need more reduction to fit within the limit, lower the quality by 5 points and reconvert. If the file is already comfortably under your target, you can push quality up for better fidelity.
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Download when the size and quality are acceptable
Once the file size meets your target and the preview looks good at 100 percent zoom with no visible artifacts in fine text, sharp edges, or saturated colour areas, click Download to save the JPG to your default Downloads folder. The output is ready to upload to your CMS, attach to an email, post to social media, or distribute through any other channel that prompted the size-reduction conversion in the first place.

Real-world examples

Common situations where this approach makes a real difference:

Email attachment within a 10 MB limit

A consultant attaching five product photos to a client email finds the PNGs total 22 MB, over the Gmail 25 MB limit with no room for other attachments. Converting each photo to JPG at 85% quality reduces the total to approximately 3 MB. All five images fit in a single email with room for other attachments, and the photos remain visually excellent at the email preview size.

CMS upload with a 1 MB per-image cap

A content editor uploading blog images to WordPress encounters a 1 MB upload limit. Their PNG photographs are 2-5 MB each. Converting to JPG at 88% quality reduces them to 250-700 KB each -- all comfortably under the 1 MB cap. The images display sharply at the 800px width the blog theme uses, and the quality difference from the original PNG is invisible at that display size.

Reducing cloud storage costs

A photographer stores 10,000 PNG exports in Google Drive, occupying 45 GB and approaching the storage plan limit. Converting all photographs to JPG at 90% quality reduces the storage requirement to approximately 6 GB -- a 90% reduction that brings the library back within the free storage tier. The originals from the camera (RAW files) are archived separately, so the JPG library is used only for sharing and client review.

Speeding up a slow-loading web page

A web developer audits a product page that scores poorly on Core Web Vitals. The hero image is a 4.2 MB PNG that takes 8 seconds to load on a 4G connection. Converting to JPG at 88% quality produces a 480 KB file. The page now loads the hero image in under 1 second on the same connection, improving the Largest Contentful Paint score from 8.1s to 0.9s and lifting the page into the "Good" performance tier.

Pro tips

Get better results with these expert suggestions:

Use the file size display to work backwards from a target

If you need a JPG under a specific size (for example 500 KB for a platform upload limit), start the quality slider at 88% and check the output size. If the file is 620 KB, reduce to 83% and reconvert. The file size display in the preview panel means you can reach any file size target precisely without guessing. Most photographs reach 500 KB somewhere in the 80-90% quality range.

Resize before converting for maximum size reduction

Combining resolution reduction with format conversion produces the greatest file size savings. A 4000x3000 photograph as JPG at 90% might be 1.2 MB. The same photo resized to 1920x1440 and then converted to JPG at 90% might be 280 KB -- a much larger total reduction. If your use case does not require full resolution (web use, email, social media), resize first using the FixTools Image Resizer.

Progressive JPEG can improve perceived load speed

Standard JPEG loads top-to-bottom (baseline). Progressive JPEG loads in multiple passes, showing a low-resolution version of the whole image first, then improving in quality. For large web images, progressive JPEG makes the page feel faster because users see the full composition immediately. Ask your image processing tool or CMS whether it supports progressive JPEG encoding, as it improves perceived performance without changing file size.

Re-check quality after resizing

If you resize an image in addition to converting to JPG, always inspect the result at 100% zoom after the combined operation. Downsampling and JPG compression together can sometimes produce unexpected artifacts at text edges or fine details that were not visible when evaluating either operation independently. A quick 100% zoom check takes 30 seconds and catches any unexpected quality issues before the file is published.

FAQ

Frequently asked questions

For photographic content, JPG at 90 percent quality is typically 75 to 85 percent smaller than the equivalent PNG. A 5 MB PNG photograph often becomes a 600 to 900 KB JPG at 90 percent quality without any visible degradation at standard viewing scales on phones, laptops, or desktop monitors. For screenshots and flat graphics, the reduction is smaller at roughly 50 to 70 percent and the quality trade-off is more noticeable around sharp edges and fine text. The exact difference depends heavily on image content: photographs compress most efficiently because the DCT algorithm targets exactly the kind of frequency information that natural imagery contains, while flat graphics and images with large areas of solid colour compress less dramatically because there is less variable detail to discard.

For photographs, 85 to 90 percent quality produces a reduction of 75 to 85 percent with no visible quality loss in standard viewing conditions including print and high-resolution displays. For screenshots and graphics with text or sharp edges, 88 to 92 percent is the minimum to avoid visible artifacts around character edges and fine UI lines. Use 80 to 85 percent for photographs when you need aggressive file size reduction and the output will be viewed at reduced size such as web thumbnails, email inline previews, or chat message attachments where the recipient is unlikely to zoom in. Above 95 percent the file size grows without any perceptible quality benefit.

At quality settings of 85 percent and above, JPG photographs look identical to their PNG source when viewed at normal screen sizes and zoom levels on any modern display. The mathematical difference between the two files exists in the file data and can be detected by automated image comparison tools, but it is below the visual detection threshold for photographic content for human observers. At 100 percent zoom on a high-resolution display with a deliberate side-by-side comparison, a trained eye might detect minor smoothing in very fine textures. For practical sharing and publishing purposes, 85 percent and above JPG is functionally indistinguishable from PNG for every realistic viewing scenario.

Yes, significantly, and combining resizing with format conversion produces the largest total reductions of any technique available. Halving the pixel dimensions of an image, for example from 4000x3000 down to 2000x1500, reduces the image area by 75 percent which proportionally reduces the file size before compression even runs. Combining a 50 percent resize with JPG conversion at 88 percent quality produces the largest total file size reductions you can achieve without visibly degrading the image. For web use where images display at 600 to 1200 pixels wide on most devices, resizing from 4000 pixels wide to 1200 pixels wide and converting to JPG can reduce a 6 MB PNG to under 150 KB.

Yes. FixTools shows the output file size in the preview panel after conversion runs, before you commit to downloading the file to your device. You can see both the original PNG size and the converted JPG size side by side in the preview, with the percentage reduction calculated and displayed for easy comparison. If the output is larger than your specific target for the destination platform, adjust the quality slider down by a few percentage points and reconvert to iterate toward the target. This feedback loop lets you hit any file size target precisely without needing to download multiple test files and check them externally.

If your JPG is larger than expected after conversion, check three things in order. First, the quality setting: high quality settings like 95 to 100 percent produce relatively large files because little frequency data is being discarded by the encoder. Second, the image dimensions: very high resolution images at 4K or larger remain large even in JPG because the pixel count itself is high. Third, the image content type: flat graphics and screenshots with large areas of solid colour compress less efficiently in JPG than photographs do. Try lowering quality to 85 to 88 percent and using the Image Resizer to reduce pixel dimensions if needed for the destination.

Common email file size limits sit at well-known thresholds: Gmail 25 MB total per message, Outlook 20 MB, Yahoo Mail 25 MB, and iCloud Mail 20 MB. Corporate email servers vary widely depending on IT policy, with many companies setting limits of 5 to 10 MB per message at the gateway to control storage growth across the organisation. Converting photographs from PNG to JPG at 85 to 90 percent quality reduces file sizes by 75 to 85 percent, easily bringing most images under any standard email limit even when combined with other attachments. For five or more image attachments in a single email, convert all images and aim for 500 KB to 1 MB each as a working target.

Yes, using PNG compression tools that apply more aggressive DEFLATE compression alongside techniques like palette reduction and metadata stripping. Tools like PNGCrush, PNGOUT, OptiPNG, and TinyPNG can reduce PNG file size by 15 to 30 percent without any quality loss at all because the underlying DEFLATE compression is lossless and there are multiple ways to encode the same pixel data. However, this is much smaller than the 75 to 85 percent reduction achievable by converting to JPG for photographic content. For photographs where quality loss at 85 percent and above is imperceptible, PNG compression is not competitive with JPG conversion. For logos and graphics where lossless compression is essential to preserve sharp edges, PNG optimisation tools are the right approach.

The order does not affect the final output significantly because both operations work on the same underlying pixel data and the encoder applies its quantization step at the end regardless of when the resize happened. However, resizing first and converting second is the more common workflow because it lets you inspect the resized image at its new dimensions before deciding on the quality setting for the conversion, which makes it easier to dial in the right balance. FixTools and most other tools support both orderings, so use whichever feels more natural in your workflow. The combined operation produces the largest total file size reductions for any image where both steps are needed.

The lower limit depends entirely on the image content and viewing scale. For photographs viewed at thumbnail sizes such as gallery grid views or chat previews, quality settings as low as 65 to 75 percent can still look acceptable because the small display size masks any artifacts. For screenshots with text that must remain readable, do not drop below 85 percent or fine character edges develop visible blur. For full-size photographic viewing on desktop monitors, 80 percent is usually the lower bound before quality loss becomes noticeable to the average viewer. The right minimum is the lowest setting where your preview at 100 percent zoom still looks acceptable for the intended use case.