Images · Local utility

Image Format Converter

Convert images between PNG, JPEG, and WebP entirely in your browser, with honest before-and-after byte sizes.

Runs locally · Nothing is uploaded

LOCAL CONVERSION STUDIO

Image Format Converter

Convert PNG, JPEG, WebP, GIF, and AVIF images to PNG, JPEG, or WebP, with before-and-after byte sizes shown exactly as measured.

Choose file

Drop an image here or use Choose fileMaximum 12 MiB · up to 8,192 px per side · 24,000,000 total pixels

01 / SOURCE

Validated local file

Empty

No image selectedA preview appears only after signature, size, dimensions, and EXIF checks pass.

02 / CONTROLS

Exact local processing

Waiting

Output formatPNG — lossless, keeps transparencyJPEG — smaller files, no transparencyWebP — smaller files, keeps transparency

Checking whether this browser can encode WebP…

Re-encoding does not carry over ICC color profiles: wide-gamut (Display P3) sources land in sRGB, and CMYK JPEG decoding varies by browser.

Local-only executionNo uploads, network requests, storage, analytics payloads, or logs contain your file or output.

03 / RESULT

Generated export

No generated resultChoose a valid file, adjust controls, then run the local action. Any edit clears the previous export.

Task path / input to outcome

How to convert an image to PNG, JPEG, or WebP

01
Choose one image
Select Choose file or drop an image up to 12 MiB. The input is sniffed by file signature: PNG, JPEG, and WebP are read directly, GIF converts as its first frame only with an animation-loss notice next to the file, and AVIF is accepted only after the browser proves it can decode the file.
02
Pick the output format
Choose PNG, JPEG, or WebP. PNG is lossless and keeps transparency. JPEG and WebP take a quality slider from 50% to 95%, defaulting to 85%. The WebP option is enabled only after a one-pixel encode probe confirms this browser really encodes WebP; where it cannot, the option stays disabled with an explanation instead of silently exporting a PNG named .webp.
03
Set JPEG flattening if needed
JPEG has no alpha channel, so transparent pixels are flattened onto a background color — white by default, adjustable with the color picker next to the option. The page also states the fixed color caveat: re-encoding does not carry over ICC color profiles, wide-gamut (Display P3) sources land in sRGB, and CMYK JPEG decoding varies by browser.
04
Convert, compare, download
Press Convert image. The result panel shows the input and output formats, the dimensions, and the byte size before and after exactly as measured, plus the percentage change — no compression rate is promised. Download saves a file named toolars-<original name>.<extension>.

Your input stays in the browser.

Image Format Converter uses its verified local execution path and does not create a hidden input or output history.

Local execution

Runs inside the current browser tab.

No hidden processing

Active tool data never becomes a Toolars document record.

No account required

Use the core workflow without creating a profile.

Immediate reset

Clear the tab and the active working data is gone.

When Image Format Converter is useful

Focused transformations

Complete one well-defined browser task without setting up another application.

Copy-ready output

Review the result beside its source before copying or downloading it.

Fast validation

Catch malformed input and stale results before they enter another workflow.

What Image Format Converter actually does

A WebP for a faster product page, a JPEG small enough for an email attachment, a PNG when only lossless will do — one page covers the everyday conversions instead of a maze of per-pair tools. A designer exporting assets, a developer shrinking a hero image, a seller compressing listing photos: each drops a file in, picks the target format, sees the size trade-off in plain bytes, and leaves with the converted copy. The image never leaves the device.

Deterministic output

The same source and selected mode produce the same result.

Source stays visible

Compare the original text and transformed value together.

Private by default

No active workspace value is stored or sent to a server.

Errors stay explicit

Invalid values return a clear error instead of stale output.

Common questions

Which input formats are supported?

PNG, JPEG, WebP, and GIF up to 12 MiB, sniffed by file signature. GIF converts as its first frame only — the animation loss is disclosed on input. AVIF is accepted when the browser proves it can decode the file; otherwise the workspace refuses it with a clear error instead of guessing.

Will WebP export work in every browser?

No, and the converter refuses to pretend: a one-pixel probe checks whether the browser really encodes WebP. Where it cannot, the WebP option is disabled with an explanation rather than silently handing back a PNG renamed .webp.

Does JPEG output keep transparency?

No. JPEG has no alpha channel, so transparent areas are flattened onto a background color — white by default — with the consequence disclosed next to the control. Choose PNG or WebP to preserve transparency.

Is the conversion lossless?

PNG output is. JPEG and WebP recompress at the quality you pick, and no lossless WebP tier is offered because the browser encoder does not expose one. ICC color profiles are not carried over, so wide-gamut images land in sRGB.

Continue in Image Studio