PBM は白黒 2 値の portable bitmap です。1 ピクセル 1 ビットという最も単純な画像形式で、自作ツールでも扱えます。
Typical use: 2 値マスクを保つなら PBM、閲覧には PNG へ変換します。
About the PBM format
PBM は白黒 2 値の画像形式です。1 ピクセルを 1 ビットで表すという最も単純な構造です。
マスクや 2 値画像の処理に向きます。閲覧には PNG への変換が便利です。
Strengths
- ✓ 構造が極めて単純
- ✓ 容量が小さい
- ✓ Zero patents, zero compression surprises
Limitations
- ✗ 2 値しか表現できない
- ✗ 一般的な用途には不向き
- ✗ No alpha channel
- Structure
- P1 (ASCII) / P4 (binary) header + bits
- Types / schema
- 1-bit black & white
- Compatibility
- netpbm, GIMP, ImageMagick
- Best for
- Print/fax pipelines, 1-bit art
Convert PBM to…
54 direct directions plus 15 workflows, sorted A–Z; 🔥 marks popular targets.
Convert other files to PBM…
Frequently asked questions
What is a PBM file?
PBM is the 1-bit member of the netpbm family: pure black and white, stored as readable ASCII or packed bits. It is the simplest image format that still counts as one — which is why half a century of tools can read it.
How do I convert PBM files online?
Pick a target format from the "Convert PBM to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert PBM files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can PBM convert to?
This page lists all 69 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.