CONVERT
AVIF → PCX
Fast, secure AVIF to PCX conversion. No registration required.
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Setup: AVIF is the AV1-based next-gen image codec, extremely efficient with full HDR and alpha support. Goal: an interchangeable PCX. Converting AVIF to PCX swaps one image container for another without leaving the image family. The choice usually comes down to compatibility with the tool or platform that will consume the file next — some editors handle PCX natively while AVIF still requires a plugin or extra step. KaijuConverter re-encodes in the browser session with ImageMagick, preserving resolution and colour profile, and leaves the source AVIF untouched. Background. AVIF is the AV1-based next-gen image codec, extremely efficient with full HDR and alpha support. Destination side, PCX is the legacy ZSoft/PC Paintbrush bitmap format from the DOS era.
AVIF Image
Source formatAVIF is a next-generation image format based on the AV1 video codec. It offers significantly better compression than JPEG and WebP while maintaining excellent visual quality, including HDR and wide color gamut support.
PCX Image
Target formatPCX (PiCture eXchange) is a legacy raster image format created by ZSoft for their PC Paintbrush program. It was one of the first widely supported image formats on IBM PC compatibles and uses simple run-length encoding compression.
Why convert AVIF to PCX
Both AVIF and PCX describe a grid of pixels — the difference lies in how that grid is compressed, whether transparency is supported, and which software opens it natively. Moving from AVIF to PCX is worth it when the PCX ecosystem is broader for your use case, or when PCX compresses photographs more efficiently than AVIF.
HOW TO CONVERT
AVIF → PCX
Drop the AVIF file
Drag and drop or click to upload your AVIF. The image is transferred securely over HTTPS and queued for conversion.
Re-encode with ImageMagick
ImageMagick decodes every pixel of the AVIF and writes a matching PCX with sensible default quality settings.
Download the PCX
The converted PCX is ready to download as a single file; both files delete automatically within two hours.
Common Use Cases
Web publishing and CMSes
PCX uploads cleanly to WordPress, Ghost, Webflow and most blogging platforms; many CMSes silently transcode or reject AVIF.
Email attachments
Email clients preview PCX inline while AVIF may arrive as an unrecognised attachment on older Outlook or mobile apps.
Social media uploads
Platforms like Instagram, X and Facebook accept PCX natively; AVIF is often rejected or silently converted with unpredictable results.
Design hand-off
Designers shipping assets to developers prefer PCX for faster pipeline imports and consistent display across build tools.
AVIF vs PCX — Strengths and limitations
What each format does best, and where it falls short.
AVIF Strengths
- Best-in-class compression efficiency — 30-50% smaller than JPEG for the same quality.
- Royalty-free and patent-unencumbered (unlike HEIC).
- Supports alpha transparency, HDR, wide gamut (BT.2020), and up to 12-bit color.
- Progressive decoding: a blurry preview appears while the file is still downloading.
- Supported in all major browsers since late 2022 — no polyfills needed.
Limitations
- Encoding is CPU-expensive — an AVIF export can take 10-30× longer than JPEG.
- Older software (pre-2022) cannot open AVIF without plugins.
- Email clients still largely ignore it — stick to JPEG for attachments.
PCX Strengths
- Simple format — easy to parse in any language.
- RLE compression keeps flat-color images compact.
- Historic archive format for 1985-1995 PC art.
- Stable since 1985 with no breaking changes.
Limitations
- Legacy — no new content created as PCX in 2026.
- Inefficient for photographs (RLE is wrong algorithm).
- Limited to 24-bit color depth.
AVIF vs PCX — Technical specifications
Side-by-side comparison of the technical details.
| Specification | AVIF | PCX |
|---|---|---|
| MIME type | image/avif | image/x-pcx |
| Container | HEIF (ISOBMFF) | — |
| Codec | AV1 (intra-only) | — |
| Max dimensions | 65 536 × 65 536 px | — |
| Color depth | Up to 12-bit per channel | — |
| Color spaces | sRGB, Display-P3, BT.2020, arbitrary ICC | — |
| Extension | — | .pcx |
| Header | — | 128 bytes fixed |
| Compression | — | Run-Length Encoding (RLE) |
| Creator | — | ZSoft Corporation (1985) |
AVIF vs PCX — Typical file sizes
Approximate file sizes for common scenarios.
AVIF
- Thumbnail (400px) 10-30 KB
- Web photo (1920px) 80-300 KB
- 4K photo (3840px) 300 KB - 1.2 MB
- Lossless copy of 24MP photo 8-15 MB
PCX
- Simple clipart 2-40 KB
- VGA-era screenshot (320×200) 30-80 KB
- Scanned page 200 KB - 2 MB
Quality & Compatibility
If PCX is a lossless format (PNG, TIFF, BMP) the output keeps every pixel of the decoded AVIF exactly. If PCX is a lossy codec (JPEG, WebP, HEIC), the encoder re-compresses the image at the quality level you select — default 85 is transparent for photographs, quality 92+ for illustrations with hard edges.
Tips for Best Results
- Keep the original AVIF alongside the PCX output — re-encoding already-lossy images accumulates detail loss on each round.
- If the PCX will be uploaded to a CMS, check whether the platform has a max dimension and downscale once on export rather than letting the CMS resize automatically.
- For thumbnails and avatars, export the PCX at exactly the display size; browsers will otherwise resample and the image may look soft.
Frequently Asked Questions
Frequently Asked Questions
It depends on the codecs involved. If both AVIF and PCX are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If PCX is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded AVIF exactly, but cannot recover detail that AVIF had already compressed away.
Often yes, especially when PCX is lossless. AVIF tuned for efficient web delivery will usually produce smaller files than PCX's default settings. If file size matters, drop the quality in Advanced or pick a more compressed target format instead.
KaijuConverter uploads over HTTPS, processes the image in an isolated container and deletes both the source and the output within two hours. No account is required, file contents are never logged, and we do not use uploads to train any model. For confidential material, the paid plan includes a data-processing agreement.
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Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.