# mSIZER [](https://openmacapps.com/apps/msizer/) [](https://github.com/starbudweiser/mSIZER/releases/latest) [](LICENSE) Batch photo editor for macOS: resize, crop, rotate, retouch, watermark, rename and convert hundreds of photos in a few clicks. A personal, simplified alternative to [Photo Bulk Editor](https://photobulkeditor.com/). 🇬🇧 English · 🇫🇷 [Français](#français) ## About mSIZER is made by Starbudweiser & Claude Code (Anthropic). MIT License, © 2026 Starbudweiser. Provided as is, without warranty: keep a copy of your originals before replacing them. Inspired by Photo Bulk Editor, not affiliated with it. See "About mSIZER" in the app menu. ## Features - Drop photos or folders, see a live before/after preview of the selected photo. - Resize (long side, width, height, percentage, fit in a box, fill a box), never enlarge, Lanczos quality. - Crop to a ratio (1:1, 4:3, 3:2, 16:9, 4:5, 9:16 or custom) with a chosen anchor. - Manual crop with free handles on the preview (optional ratio lock, one framing per photo, "apply to all"). - Rotate 90°/180°, flip, EXIF orientation applied automatically. - Adjustments: auto enhance, brightness, contrast, saturation, sharpness, black and white. - Watermark: text or logo, nine positions, size and opacity. - Output: JPEG, PNG, HEIC, TIFF or same as source; quality slider; **maximum file size** (quality adapts automatically); sRGB conversion. - Metadata: keep, remove GPS location only, or erase everything. - Rename with a pattern (`{name}`, `{n}`, `{date}`, `{w}`, `{h}`). - Destination: `mSIZER` subfolder, another folder, or replace the originals (they go to the Trash). Existing files are never overwritten. - Presets (Web, E-mail, Instagram, thumbnails, privacy…) and your own saved presets. - Output formats: JPEG, PNG, WebP, HEIC, AVIF, JPEG 2000, TIFF, GIF, BMP, TGA, PSD, PDF, OpenEXR, ICO, ICNS (WebP through a statically linked libwebp; build needs `brew install webp`). - Social network presets (Instagram, Facebook, X, LinkedIn, YouTube, TikTok, Pinterest, Snapchat, WhatsApp, Discord, Twitch): posts, stories, profile pictures, banners at the exact size. - Languages: French, English, Spanish, Italian (follows the system language). Interface follows the Socle design system. - Automatic updates from GitHub releases (signature checked, never during a batch), with a manual check button. ### Apple Silicon Apple Silicon only (arm64, tuned for the M family). Filters run on the GPU through Core Image / Metal, JPEG and HEIC decoding is hardware accelerated and reduced by the decoder when possible, and photos are processed in parallel on the performance cores only. ## Install **[Download the latest notarized release](https://github.com/starbudweiser/mSIZER/releases/latest)**, unzip it and move **mSIZER.app** to your Applications folder. Requires **macOS 15 Sequoia on Apple Silicon** or later. ## Build ```bash ./build_app.sh # builds, signs and installs ~/Applications/Applications Personnelles/mSIZER.app ./tests/run_tests.sh ``` Requires macOS 15 or later and the Swift toolchain. ## Languages English, French, Spanish and Italian. The app follows your Mac's preferred language automatically (English if it is none of these four). ## Support Bug reports and suggestions: [GitHub Issues](https://github.com/starbudweiser/mSIZER/issues). ## License Released under the **MIT License**, © 2026 Starbudweiser. See [LICENSE](LICENSE). --- ## Français Éditeur de photos par lots pour macOS : redimensionner, recadrer, pivoter, retoucher, filigraner, renommer et convertir des centaines de photos en quelques clics. Une alternative personnelle et simplifiée à Photo Bulk Editor, sans lien avec lui. - Aperçu avant/après en direct, redimensionnement Lanczos, recadrage par ratio ou à la main, réglages, filigrane texte ou logo. - Nombreux formats de sortie (JPEG, PNG, WebP, HEIC, AVIF, TIFF, PDF…), taille de fichier maximale, métadonnées conservées ou effacées. - Préréglages (web, e-mail, réseaux sociaux) et préréglages personnels. Gardez une copie de vos originaux avant de les remplacer. - Apple Silicon uniquement (filtres sur le GPU, traitement parallèle). Installation : téléchargez la [dernière version notarisée](https://github.com/starbudweiser/mSIZER/releases/latest), décompressez-la et placez **mSIZER.app** dans Applications (macOS 15 Sequoia ou plus récent). Interface en français, anglais, espagnol et italien, choisie d'après la langue du Mac (anglais sinon). Licence MIT, © 2026 Starbudweiser. Questions et bugs : [Issues GitHub](https://github.com/starbudweiser/mSIZER/issues).