WebP Discussion - Google Groups

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Welcome to webp-discuss

This is the place to ask everything about WebP, the image compression format.

Main page: https://developers.google.com/speed/webp/
Bug tracker: https://issues.webmproject.org/

Discussions are rather technical most of the time, but not always!

0 selected

Jul 5

unread,

Jul 5

Jason Carswell, … Stanislav Petrov7

Jun 23

FastStone + WebP = I just want it to work.

faststone+https://storage.googleapis.com/downloads.webmproject.org/releases/webp/WebpCodecSetup.exe

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FastStone + WebP = I just want it to work.

faststone+https://storage.googleapis.com/downloads.webmproject.org/releases/webp/WebpCodecSetup.exe

Jun 23

Gianni Rosato, m st2

Jun 23

Iris-WebP, a new WebP encoder

Hey Gianni, Can I get a demo/sample? On Thu, Jun 18, 2026 at 10:53 PM Gianni Rosato <gianni@halide

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Iris-WebP, a new WebP encoder

Hey Gianni, Can I get a demo/sample? On Thu, Jun 18, 2026 at 10:53 PM Gianni Rosato <gianni@halide

Jun 23

May 4

discussing security ideas

Hello, The libwebp library is listed as in scope project for google patch rewards. I am individual

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discussing security ideas

Hello, The libwebp library is listed as in scope project for google patch rewards. I am individual

May 4

Apr 20

A pure Java, zero-dependency, full-featured WebP decoding library

Hi, For a long time, we hadn't been able to find a satisfactory WebP library for JavaFX. The

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A pure Java, zero-dependency, full-featured WebP decoding library

Hi, For a long time, we hadn't been able to find a satisfactory WebP library for JavaFX. The

Apr 20

Keenan Wang, James Zern2

Mar 27

[Security] Request to Change Report Type from Bug to Security Vulnerability

Thanks for the report. The issue has been updated and moved to the WebP component. On Friday, March

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[Security] Request to Change Report Type from Bug to Security Vulnerability

Thanks for the report. The issue has been updated and moved to the WebP component. On Friday, March

Mar 27

Etienne Loiseau, … Alexey Pavlov21

Feb 25

Webp in gmail / transparency issues

February 2026 and the problem persists. regards. On Thursday, December 5, 2024 at 11:42:54 PM UTC+3

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Webp in gmail / transparency issues

February 2026 and the problem persists. regards. On Thursday, December 5, 2024 at 11:42:54 PM UTC+3

Feb 25

↕成功, … James Zern7

Jan 5

A question about libwebp building for ESP32C3

Hi, On Sat, Dec 20, 2025 at 2:48 AM Xu Yong <zqx...@gmail.com> wrote: Thanks for your reply. I

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A question about libwebp building for ESP32C3

Hi, On Sat, Dec 20, 2025 at 2:48 AM Xu Yong <zqx...@gmail.com> wrote: Thanks for your reply. I

Jan 5

Dima, … Stephen Varthas6

12/29/25

Can webp animations be streamed?

who are you replying to Tim Zetah hes enslaving people i promise he will be exposed Tim stop

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Can webp animations be streamed?

who are you replying to Tim Zetah hes enslaving people i promise he will be exposed Tim stop

12/29/25

Seriki Olalekan (Web4)

12/24/25

Re: Issue 470992419: Build error because the system headers get picked instead of in-tree headers

Can i participate? Sent from Outlook for iOS From: buganize...@google.com <buganizer-system@

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Re: Issue 470992419: Build error because the system headers get picked instead of in-tree headers

Can i participate? Sent from Outlook for iOS From: buganize...@google.com <buganizer-system@

12/24/25

Dan Weaver, … knaz5

12/11/25

Webp In GDrawings, GSlides, GDocs: UNSUPPORTED Image Type

4 years later ... still unsupported wtf On Wednesday, May 19, 2021 at 5:39:58 AM UTC-4 Pascal

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Webp In GDrawings, GSlides, GDocs: UNSUPPORTED Image Type

4 years later ... still unsupported wtf On Wednesday, May 19, 2021 at 5:39:58 AM UTC-4 Pascal

12/11/25

Joanna Kus, … James Zern6

11/13/25

Failing to build WebP JavaScript decoder on MacOS

On Thu, Nov 13, 2025 at 2:42 PM Joanna Kus <jk...@superfile.com> wrote: Thank you so much.

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Failing to build WebP JavaScript decoder on MacOS

On Thu, Nov 13, 2025 at 2:42 PM Joanna Kus <jk...@superfile.com> wrote: Thank you so much.

11/13/25

Wilder Wells, … Jake Mathew9

11/7/25

Workflow to export animated WebP directly from After Effects?

I know this is an older thread, but for anyone else who finds this and is looking for a simpler

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Workflow to export animated WebP directly from After Effects?

I know this is an older thread, but for anyone else who finds this and is looking for a simpler

11/7/25

Александр Рощупкин, James Zern9

11/4/25

libwebp in VB 6.0 programs.

Hello, James! Here's a link to the finished result: https://disk.yandex.ru/d/vrWheggvXeRexw Both

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libwebp in VB 6.0 programs.

Hello, James! Here's a link to the finished result: https://disk.yandex.ru/d/vrWheggvXeRexw Both

11/4/25

C. Neidahl, Vincent Rabaud2

9/29/25

libwebp uses wrong WORDS_BIGENDIAN value when configuring for big-endian via CMake

Thank you very much for the patch, we indeed never tested that scenario. https://chromium-review.

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libwebp uses wrong WORDS_BIGENDIAN value when configuring for big-endian via CMake

Thank you very much for the patch, we indeed never tested that scenario. https://chromium-review.

9/29/25

黄世平, James Zern2

9/4/25

alpha_enc.c ApplyFiltersAndEncode crash

Hi, On Thu, Sep 4, 2025 at 5:07 AM 黄世平 <aiya1...@163.com> wrote: In Android ASOP, I Have a

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alpha_enc.c ApplyFiltersAndEncode crash

Hi, On Thu, Sep 4, 2025 at 5:07 AM 黄世平 <aiya1...@163.com> wrote: In Android ASOP, I Have a

9/4/25

James Zern, … Vincent Rabaud8

7/9/25

[ANN] libwebp 1.6.0 release candidate

On Tuesday, July 1, 2025 at 5:27:53 PM UTC-7 James Zern wrote: Hi, Source and binary archives are

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[ANN] libwebp 1.6.0 release candidate

On Tuesday, July 1, 2025 at 5:27:53 PM UTC-7 James Zern wrote: Hi, Source and binary archives are

7/9/25

4/10/25

cwp2 does not accept a PNG file (WebP 2, libwebp2)

Please disregard this thread. There is no problem with the commit. It seems there was something wrong

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cwp2 does not accept a PNG file (WebP 2, libwebp2)

Please disregard this thread. There is no problem with the commit. It seems there was something wrong

4/10/25

4/8/25

The build of libwebp2 (WebP 2) fails with MSVC error C7555

I confirmed that the issue has been resolved. Thank you very much. 2025年4月8日火曜日 9:37:53 UTC+9

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The build of libwebp2 (WebP 2) fails with MSVC error C7555

I confirmed that the issue has been resolved. Thank you very much. 2025年4月8日火曜日 9:37:53 UTC+9

4/8/25

adit...@gmail.com, … CNCVelMart7

4/8/25

The Windows Explorer WEBP codec

Thanks, view webp file windows7, filebrowser, image(midle to extra large) mode. Previously, I could

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The Windows Explorer WEBP codec

Thanks, view webp file windows7, filebrowser, image(midle to extra large) mode. Previously, I could

4/8/25

clark zheng, James Zern4

3/12/25

Cross-compiling error

On Wed, Mar 12, 2025 at 4:02 PM clark zheng <clarkz...@gmail.com> wrote: Hi, thanks for the

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Cross-compiling error

On Wed, Mar 12, 2025 at 4:02 PM clark zheng <clarkz...@gmail.com> wrote: Hi, thanks for the

3/12/25

2/24/25

Multiple errors occur during the build of libwebp2(WebP 2)

I have confirmed that the issue has been resolved. Thank you very much. 2025年2月22日土曜日 13:40:29 UTC+9

unread,

Multiple errors occur during the build of libwebp2(WebP 2)

I have confirmed that the issue has been resolved. Thank you very much. 2025年2月22日土曜日 13:40:29 UTC+9

2/24/25

Serge, … James Zern7

2/21/25

Comparative Analysis on WebP and JPEG Decoding Performance

On Wed, Feb 19, 2025 at 4:25 PM James Zern <jz...@google.com> wrote: Hi, On Tue, Feb 18, 2025

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Comparative Analysis on WebP and JPEG Decoding Performance

On Wed, Feb 19, 2025 at 4:25 PM James Zern <jz...@google.com> wrote: Hi, On Tue, Feb 18, 2025

2/21/25

Panagiotis Paraskeva, … Rishabh Gupta11

2/9/25

Android import for Libwebp

hey i checkout your repo, it's not support transparent background earlier i use this repo

unread,

Android import for Libwebp

hey i checkout your repo, it's not support transparent background earlier i use this repo

2/9/25

1/23/25

Re: Issue 391092769: Bitmap.Clone() doesn't always honor requested PixelFormat and thus results in Stackoverflow in Encode() recursion.

Ok On Thu, 23 Jan 2025, 10:00 pm , <buganize...@google.com> wrote: Replying to this email

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Re: Issue 391092769: Bitmap.Clone() doesn't always honor requested PixelFormat and thus results in Stackoverflow in Encode() recursion.

Ok On Thu, 23 Jan 2025, 10:00 pm , <buganize...@google.com> wrote: Replying to this email

1/23/25

Mathias Schindler

1/2/25

Steganography using WebP

In 2023, Katarzyna Koptyra and Marek R. Ogiela published "An Efficient Steganographic Protocol

unread,

Steganography using WebP

In 2023, Katarzyna Koptyra and Marek R. Ogiela published "An Efficient Steganographic Protocol

1/2/25

Linda Cannon, … James Zern6

12/21/24

Bulk conversions?

Glad to hear it. If you have any other questions please feel free to ask. On Fri, Dec 20, 2024 at 5:

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Bulk conversions?

Glad to hear it. If you have any other questions please feel free to ask. On Fri, Dec 20, 2024 at 5:

12/21/24

12/19/24

[ANN] libwebp 1.5.0 release candidate

Hi, On Fri, Dec 13, 2024 at 12:42 PM James Zern <jz...@google.com> wrote: Hi, Source and binary

unread,

[ANN] libwebp 1.5.0 release candidate

Hi, On Fri, Dec 13, 2024 at 12:42 PM James Zern <jz...@google.com> wrote: Hi, Source and binary

12/19/24

William Borg Barthet, James Zern2

11/12/24

WebP for Java applications

Hi, On Tue, Nov 12, 2024 at 6:38 AM William Borg Barthet <william.b...@bloomreach.com>

unread,

WebP for Java applications

Hi, On Tue, Nov 12, 2024 at 6:38 AM William Borg Barthet <william.b...@bloomreach.com>

11/12/24

Tim Janik, James Zern4

11/6/24

Feature Request: Add -sharp_yuv Command Line Option for Improved GIF to WEBP Conversion

On Mon, Nov 4, 2024 at 1:53 PM James Zern <jz...@google.com> wrote: On Mon, Nov 4, 2024 at 11:

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Feature Request: Add -sharp_yuv Command Line Option for Improved GIF to WEBP Conversion

On Mon, Nov 4, 2024 at 1:53 PM James Zern <jz...@google.com> wrote: On Mon, Nov 4, 2024 at 11:

11/6/24

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