Resizia resizes and compresses photos on your device. Image processing needs no network; this page may load from a host (China site → Cloudflare → here.now) with an offline fallback.
Questions or suggestions? Email 35309459@qq.com. Please include your device model, system version and the Resizia version (shown at the bottom of Settings).
Yes. Resizia is completely free, with no in-app purchases, subscriptions or ads.
No. Everything is processed on your device, and the app collects no data. See the Privacy Policy.
Tap “Photos” (or “Files”) and choose an image. Pick a mode – “Dimensions”, “File size” or “Both” – set the width / height (“W” / “H”) or a “Target” size in KB or MB, then tap “Start” and “Save to Photos” or “Share”.
Input: JPG, PNG, HEIC, WebP and other formats the system can decode. Output: JPEG, PNG or HEIC (Android: JPEG, PNG or WebP). PNG is not offered in File size / Both modes, because a lossless format can’t target a file size.
For very small targets the app lowers quality and then automatically reduces the dimensions. If the target still can’t be met, it shows the closest result with a note.
A ratio crop (1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3) keeps the largest area with that ratio, so the width or height is smaller than the original. The output is still the highest resolution for that ratio.
Small, side-on or poorly lit faces may not be detected. On iPhone and iPad the app then looks for the main subject, and otherwise crops from the centre (Android detects faces only and falls back to a centred crop). Tap “Adjust crop” to drag the frame yourself; a manual position always wins over the automatic result.
“Common sizes” are built-in presets such as application / profile photo sizes with a file-size limit and social media sizes (common reference values – always check the actual requirement). “My modes” saves your whole setup under a name (up to 20, stored only on your device) so you can apply it again with one tap.
Tap “Batch (up to 9 photos)”, choose up to 9 photos, set “Max width” / “Max height” (or a target size or preset), tap “Start batch”, then “Save all” or “Share all”. With a crop ratio selected, each photo’s crop can be adjusted individually.
Up to 9 photos are processed at a time. The rest are not imported, and the app tells you that the first 9 were kept.
Not by default. “Remove photo info (location, etc.)” is on by default, so outputs contain no GPS location, device model or capture time. This info is kept only if you turn the switch off.
Go to Settings › Privacy & Security › Photos › Resizia and choose “Add Photos Only” or “Full Access”.
In the Photos app, tap Share, then tap “More” at the end of the app row and turn Resizia on. Choose Resizia, tap “Done” in the “Add to Resizia” panel and open Resizia – the shared photos load automatically.
Tap the gear icon at the top right. You can choose from 35 interface languages or “System default”, switch between Light and Dark, or turn on Night mode (dark automatically from 19:00 to 07:00).
Turn on “Elder mode” in Settings for larger text and buttons.
Open Settings and tap “Restore default settings”.
Resizia 在本机调整图片尺寸并压缩文件大小。图片处理不依赖网络；本页可能从托管站点加载（国内站 → Cloudflare → here.now），打不开时使用随包离线页。
有问题或建议请发邮件至 35309459@qq.com。请尽量写明设备型号、系统版本和 Resizia 版本（在设置页底部）。
不收费。Resizia 完全免费，没有 App 内购买、订阅，也没有广告。
不会。所有处理都在你的设备上完成，应用不收集任何数据。详见隐私政策。
点“从相册选择”（或“从文件”）选择图片，选择模式“按尺寸”“按大小”或“尺寸+大小”，设置宽 / 高或目标大小（KB 或 MB），然后点“开始处理”，再点“保存到相册”或“分享”。
输入：JPG、PNG、HEIC、WebP 等系统可解码的格式；输出：JPEG、PNG、HEIC（Android 版输出 JPEG、PNG、WebP）。“按大小”和“尺寸+大小”模式下不提供 PNG（无损格式无法控制文件大小）。
目标过小时，应用会在降低画质的同时自动缩小尺寸；若仍无法达到，会给出最接近的结果并提示。
按比例裁剪（1:1、4:3、3:4、16:9、9:16、3:2、2:3）会保留该比例下的最大区域，所以宽或高会比原图小；输出仍是这一比例下的最高分辨率。
人脸太小、侧脸或光线较暗时可能识别不到，此时 iOS 版会识别画面主体，仍识别不到则居中裁剪（Android 版只识别人脸，识别不到时居中裁剪）。你可以点“调整裁剪位置”手动拖动，手动位置优先于自动结果。
“常用尺寸”是内置预设，包括报名照、头像尺寸、带文件大小限制的申请照片和社交平台尺寸等（为常见参考值，请以实际要求为准）。“我的模式”可以把整套设置保存为带名字的模式（最多 20 个，只保存在本机），以后一键套用。
点“批量处理（最多 9 张）”，选择最多 9 张照片，设置“最大宽” / “最大高”（或目标大小、预设），点“开始批量处理”，再点“全部保存”或“全部分享”。选择了裁剪比例时，每张照片的裁剪位置可以单独调整。
一次最多处理 9 张，多出的部分不会导入，App 会提示“已保留前 9 张”。
默认不会。“去除照片信息（位置等）”默认开启，输出不含 GPS 位置、设备型号和拍摄时间等信息；只有你主动关闭它时才会保留。
请前往“设置 › 隐私与安全性 › 照片 › Resizia”，选择“仅添加照片”或“完全访问”。
在“照片”App 中点分享，在 App 图标一行的最右边点“更多”，打开 Resizia。选择 Resizia 后，在“添加到 Resizia”面板点“完成”，再打开 Resizia，分享的照片会自动载入。
点右上角的齿轮图标进入设置，可在 35 种界面语言和“跟随系统”之间选择，可切换浅色 / 深色，也可打开“夜间模式”（每天 19:00 至次日 07:00 自动切换为深色）。
在“设置”中打开“长辈模式”，可获得更大的字体和按钮。
进入“设置”，点“恢复默认设置”。