Private by design
image processing stays in your browser. ResizeNest does not need your original image uploaded to an application server.
Image converter
PNG to WebP
Convert still 8-bit PNG images to WebP in your browser. Lossless WebP is the default for logos, UI assets and transparency-sensitive graphics; lossy quality is an explicit choice. ResizeNest keeps alpha for supported PNG input, blocks APNG and 16-bit PNG rather than hiding frame or precision loss, and reports the real worker output without uploading the original image.
Local processing Batch ready PNG
Start here
Use png to webp now
No account is required. Choose a file and work directly in this browser.
Conversion switcherOn-device
PNG → WEBP: On-deviceReal output
Results come from the actual processing pipeline, with measured dimensions, bytes and format instead of placeholder estimates.
Simple workflow
Process one image or a local batch, then download current successful results.
Three simple steps
How to use png to webp
- 01
Choose, drop or paste PNG images. ResizeNest checks the bytes, frame count and PNG bit depth before the worker is allowed to convert them.
- 02
Keep Lossless for exact decoded 8-bit RGBA preservation, or explicitly choose Lossy and set quality. Optional resize and target-size controls reuse the shared ResizeNest pipeline.
- 03
Convert the selected image or batch, inspect the measured WebP result, then download one current WebP or a ZIP containing current successful results.
Useful details
Built for a clear, predictable result
Understand what the tool does before you download the result.
Lossless is the default for PNG
PNG is commonly used for logos, interface graphics and images with transparency, so this pair defaults to lossless WebP. The real codec fixture verifies decoded 8-bit RGBA pixels, including alpha edge values, survive lossless WebP encode and decode exactly.
Lossy WebP is an explicit smaller-file choice
Choose Lossy when you accept visual compression in exchange for potentially smaller files. Lossy mode exposes a real quality control with quality 80 as the starting point, while alpha remains preserved by the supported WebP path.
Transparency is preserved
Supported still PNG alpha is carried through the shared decoder and WebP encoder instead of being flattened onto a background. The source preview uses a checkerboard where transparency is present.
APNG is not silently flattened
Animated or multi-frame PNG is outside the still-image pair. ResizeNest rejects APNG or an indeterminate frame count instead of choosing a frame and discarding the rest without your control.
16-bit PNG is not claimed as 16-bit WebP
The current browser processing baseline is 8-bit RGBA. PNG IHDR bit depth is inspected during intake, and 16-bit PNG is blocked for this pair instead of being converted while falsely claiming 16-bit precision was preserved.
WebP is not guaranteed to be smaller
An already optimized PNG can be smaller than lossless WebP for some content. ResizeNest compares the actual encoded bytes. A target-size miss in lossless mode is reported truthfully and does not silently switch the image to lossy mode.
Dimensions stay unchanged unless you ask to resize
Normal conversion preserves the source dimensions. Optional resize and explicit target-size dimension reduction use the shared ResizeNest geometry and optimizer; final dimensions always come from the actual worker result.
Local batch and same-route workflow
Options, processing, retry, result review, single download and current-success ZIP export remain on /png-to-webp. Failed files do not erase successful results, and every retry reads the immutable original PNG instead of re-encoding an earlier WebP.
Questions, answered
Frequently asked questions
Will transparency be preserved?
Yes for supported still 8-bit PNG input. Both lossless and lossy WebP paths preserve alpha rather than flattening it to an opaque background.
When should I use lossless mode?
Use the default lossless mode for logos, UI assets, graphics with sharp edges, or whenever you need the supported decoded 8-bit RGBA pixels preserved exactly. Choose lossy only when you intentionally accept visual compression.
Why is WebP not smaller?
Lossless WebP is not guaranteed to beat every optimized PNG. Content and encoder behavior matter, so ResizeNest reports the actual output byte count instead of promising savings.
Can I convert APNG here?
Not by silently flattening it. Animated or multi-frame PNG is blocked because the pair does not expose an explicit animation-preserving or frame-selection workflow.
What happens to 16-bit PNG?
It is blocked in this pair. The current local pipeline baseline is 8-bit RGBA, so ResizeNest does not claim that 16-bit source precision would survive the conversion.
Does conversion leave /png-to-webp?
No. Settings, processing, retry, result review, single download and ZIP export all stay on /png-to-webp, and the workflow does not upload your source image to a ResizeNest server.