Practical guide
How to convert images online
Convert static JPG/JPEG, PNG, or WebP images directly in your browser, choose the output format, compare each result, and download one file or a completed batch as a ZIP.
- 01
Add images
Select or drop static JPG, JPEG, PNG, or WebP files. Several files can share the same output settings.
- 02
Choose the output
Select JPEG, PNG, or WebP. JPEG and WebP show quality controls, while JPEG also provides a background colour.
- 03
Convert and download
Compare the original and converted previews, download one result, or package the completed batch into a ZIP.
Supported formats
JPEG vs PNG vs WebP
Choose the output according to image content, transparency, compatibility, and intended use.
| Format | Compression | Transparency | Quality control | Common uses |
|---|---|---|---|---|
| JPEG / JPG | Lossy | No — transparent pixels use the selected background colour | 1–100 | Photographs, email attachments, marketplace uploads, and broad compatibility |
| PNG | Lossless | Yes | No lossy quality control | Screenshots, text, logos, diagrams, interface graphics, and transparent images |
| WebP | Lossy in this converter | Yes | 1–100 | Website photographs and graphics where modern compression and transparency are useful |
JPEG / JPG
Lossy quality and background colour
JPEG is usually practical for photographs and other continuous-tone images. It cannot retain ordinary transparent pixels.
Repeated JPEG re-encoding can introduce additional artifacts. Keep the original source when quality matters.
PNG
Lossless pixels and transparency
PNG is commonly useful for screenshots, text, interface graphics, diagrams, logos, and transparent images.
Converting a JPEG to PNG prevents another JPEG save, but it does not recover detail already lost by the JPEG source.
WebP
Lossy quality with transparency
WebP is useful for modern website photographs and graphics. It can retain transparency while using a quality-controlled output encoder.
A WebP result is not guaranteed to be smaller. Image content, quality, transparency, and the browser encoder all affect the final size.
Conversion guide
What happens during each format conversion
Changing a filename extension is not conversion. The browser decodes the source pixels and encodes a new file in the selected format.
| Conversion | What happens | Transparency | Typical size behaviour |
|---|---|---|---|
| JPG / JPEG to PNG | The JPEG pixels are re-encoded with PNG lossless compression | No transparency is created | Often larger for photographs |
| PNG to JPG / JPEG | The image is flattened onto the selected background and encoded lossily | Removed | Often smaller for photographs; varies for graphics |
| JPG / JPEG to WebP | The decoded photograph is re-encoded using the selected WebP quality | No transparency is created | May be smaller, but no reduction is guaranteed |
| PNG to WebP | The PNG pixels are re-encoded as WebP using the selected quality | Preserved | Often useful for web delivery; inspect the result |
| WebP to JPG / JPEG | The WebP image is flattened onto the selected background and encoded as JPEG | Removed | Useful for compatibility; size may increase or decrease |
| WebP to PNG | The decoded WebP pixels are re-encoded using PNG lossless compression | Preserved | Often larger, especially for photographic WebP files |
Format pairs
When to use each conversion
JPG or JPEG to PNG
Use this conversion when an application requires PNG or when the next editing step should avoid another JPEG save.
The PNG remains opaque. JPEG does not contain the alpha information needed to recreate a transparent background.
PNG to JPG or JPEG
This is commonly useful for photographs, marketplace uploads, email attachments, and systems that do not accept PNG.
Transparent pixels are permanently composited over the selected background colour before JPEG encoding.
JPG or PNG to WebP
JPG-to-WebP is often used for website photographs. PNG-to-WebP can also keep transparency for logos, interface graphics, and product cut-outs.
Compare faces, text, gradients, texture, shadows, and transparent edges before replacing the source.
WebP to JPG or PNG
Choose JPEG for broad compatibility when transparency is not required. Choose PNG when transparent pixels must remain available.
Converting a lossy WebP to PNG preserves the decoded pixels, including any artifacts already present.
Transparency
JPEG background colour and alpha handling
PNG and WebP output
PNG and WebP outputs begin with a transparent canvas, allowing transparent and semi-transparent source pixels to remain transparent.
Converting an opaque JPG to PNG or WebP does not invent transparency.
JPEG output
JPEG cannot store an ordinary alpha channel. The converter fills the destination with the selected solid colour and draws the source image over it.
Once transparency has been flattened into JPEG, converting that JPEG back to PNG or WebP cannot reconstruct the removed alpha information.
Quality
What the JPEG and WebP quality setting means
Quality is an encoder hint
JPEG and WebP quality values range from 1 to 100. Higher values normally retain more visual detail and create larger files.
A value of 80 does not mean 80% quality, and JPEG 80 is not directly equivalent to WebP 80.
Re-encoding can add loss
Every lossy conversion starts from the decoded pixels of the current source. Repeated saves can accumulate block artifacts, ringing, colour changes, and loss of fine texture.
Keep the original image and inspect the converted preview before replacing a production asset.
Dimensions and metadata
What is preserved and what may be removed
Pixel dimensions
The converter keeps the decoded pixel width and height. It does not resize, crop, rotate, upscale, sharpen, or add watermarks.
A 2400 × 1600 source remains 2400 × 1600 after conversion.
Image metadata
Canvas-based re-encoding creates a new image from decoded pixels rather than copying the original file container.
EXIF, GPS, camera settings, embedded thumbnails, comments, orientation tags, colour profiles, and editing metadata may be absent from the result.
Keep the source file when metadata, print colour management, legal evidence, authorship information, medical imagery, scientific measurement, or an archival master matters.
Batch conversion
Convert multiple images in one batch
- Images per batch
- 40
- Maximum file size
- 50 MiB
- Maximum batch size
- 250 MiB
- Maximum resolution
- 80 megapixels
Images are converted sequentially in one worker rather than decoding the entire batch at once. This reduces peak memory pressure.
Individual files can be downloaded as soon as they complete. Download all loads the ZIP code only when requested and packages the completed files locally.
High-resolution batches can still use substantial memory, especially when several transparent images or large previews are open.
Private processing
Convert images privately without uploading or signing up
No upload, account, or watermark
Selected image bytes are read through browser file APIs and transferred to a dedicated worker.
Conversion, previews, and ZIP creation happen locally. Files are not sent to an Olivez or third-party conversion endpoint.
The converter does not require an account, add a watermark, or use a paid conversion-credit counter. The documented batch, file, pixel, memory, and browser limits still apply.
Temporary browser resources
Result previews and downloads use temporary object URLs. These are released when results are replaced, files are removed, the batch is cleared, or the page is closed.
Browser-local processing is useful for confidential screenshots, unpublished designs, product photography, and client assets.
Safeguards
Current limits and unsupported files
The converter is intentionally limited to dependable static JPEG, PNG, and WebP workflows.
- Static JPG, JPEG, PNG, and WebP inputs only.
- Animated PNG and animated WebP files are rejected.
- GIF, SVG, AVIF, HEIC, HEIF, BMP, TIFF, ICO, PDF, and camera RAW files are not supported.
- The converter does not resize, crop, rotate, upscale, sharpen, or add watermarks.
- A batch may contain up to 40 images.
- Each source file is limited to 50 MiB.
- The combined source batch is limited to 250 MiB.
- Each decoded image is limited to 80 megapixels.
- EXIF, GPS, camera, thumbnail, comment, editing, and colour-profile metadata may be omitted.
- Browser memory and encoder support can impose a lower practical limit.
Troubleshooting
Why an image may fail to convert
Unsupported or misleading files
A file can be rejected when its extension, MIME type, binary signature, animation state, dimensions, or decoded content does not match the supported static formats.
Renaming a file extension does not change the real image format.
Browser or memory limits
A browser that cannot encode the selected type may return another format. The converter rejects a substituted result instead of downloading it with a misleading extension.
For a large image, reduce the batch size, close memory-heavy tabs, and try one file at a time.
Common questions
Image converter FAQ
Is this image converter free and does it require an account?
Yes. Convert supported JPG, PNG, and WebP files without signing up, buying conversion credits, or adding a watermark. Documented browser and batch limits still apply.
Can I convert multiple images without uploading them?
Yes. Multiple supported images can be validated, converted, previewed, and packaged into a ZIP inside the current browser tab without being sent to a conversion server. The documented file, batch, pixel, browser-memory, and device limits still apply.
How do I convert an image online?
Add one or more static JPG, JPEG, PNG, or WebP files, choose the output format and any available quality or background setting, select Convert, and download the completed files.
Are my images uploaded to a conversion server?
No. Validation, decoding, conversion, previews, and ZIP creation happen inside the current browser tab. Files are not sent to Olivez or a third-party conversion server.
What image formats are supported?
Static JPG/JPEG, PNG, and WebP inputs can be converted to JPG/JPEG, PNG, or WebP. Animated images and other formats are not supported.
Are JPG and JPEG different?
They normally refer to the same JPEG image format. JPG is the common three-letter filename extension; this converter accepts both .jpg and .jpeg.
Does converting an image reduce its file size?
Not necessarily. Conversion changes the encoding format. The result may be smaller or larger depending on the source, output, image content, transparency, quality setting, and browser encoder.
What happens to transparency when converting to JPG?
JPEG cannot retain ordinary transparency. Transparent and semi-transparent pixels are composited over the background colour selected before conversion.
Can converting JPG to PNG restore image quality?
No. PNG can preserve the currently decoded pixels without adding another JPEG save, but it cannot restore detail or remove artifacts already lost in the JPG source.
Does JPG to PNG create a transparent background?
No. JPEG does not contain an alpha channel that the converter could recover. Background removal is a separate image-editing task.
Why is there no PNG quality slider?
The browser PNG encoder does not expose a meaningful lossy quality setting. Showing a quality slider would imply control that is not available.
What JPEG or WebP quality should I choose?
There is no universal best value. Start in a moderate-to-high range, compare the result with the original, and inspect text, faces, gradients, texture, shadows, and transparent edges.
Is WebP always smaller than JPG or PNG?
No. WebP is often efficient, but the final size depends on the source encoding, image content, dimensions, transparency, selected quality, and browser encoder.
Are image dimensions changed?
No. The converter keeps the decoded pixel width and height. It does not resize, crop, rotate, or upscale the image.
Does the converter remove EXIF and GPS metadata?
Canvas re-encoding commonly omits EXIF, GPS, camera, thumbnail, comment, orientation, and other source-container metadata. Keep the original when metadata matters.
Can animated WebP or APNG files be converted?
No. Animated WebP and APNG files are rejected so the converter does not silently export only one frame and discard the animation.
Why did the converted image become larger?
The destination format may be less efficient for that image. Photographs often become larger as PNG, while graphics, transparency, quality settings, and the source's existing compression can also change the result.
Why did the converter reject my image?
The file may use an unsupported format, contain animation, exceed the file or pixel limits, have a misleading extension or MIME type, be damaged, or fail browser decoding.
Why are AVIF and HEIC not supported?
The tool uses dependable browser-side decoding and canvas encoding. Reliable support for every modern or device-specific format is not available across the supported browser set.
References
Image format and browser documentation
These specifications and browser references explain the image formats, transparency support, worker decoding, and canvas encoding used by the converter.