Few domestic Chinese tools can go head-to-head with international benchmarks like remove.bg on overseas review platforms; Zuotang is an exception—though overseas users know it as PicWish, boasting high scores on Trustpilot and G2 and consistently appearing on lists of "best free background removal tools." Zuotang (picwish.cn) is the domestic version of this product, developed by Apowersoft, a Shenzhen-based veteran in the utility software space that has been quietly operating for over a decade.
The path of "blooming behind the wall and fragrant within" (exporting first, then returning to the domestic market) itself demonstrates the product's quality: it was forged in the global market against its strongest competitors, rather than nurtured solely within China's comfort zone.
What is Zuotang?
Zuotang is an all-in-one AI image processing platform. Its flagship capability is background removal (matting), complemented by features such as image quality restoration, super-resolution upscaling, watermark removal, compression and conversion, batch processing, and colorization of old photos. It offers a web version (no installation required), a desktop client (more stable for batch scenarios), and mobile apps. With domestic servers ensuring fast access and RMB payment options, these are the sole reasons domestic users choose the "Zuotang" entry point over the international PicWish version.
Key Features
AI Smart Background Removal
The core signature feature. Upload an image to instantly generate a transparent background, covering portraits, products, animals, and graphics. As mentioned earlier regarding its quality, it holds a status comparable to remove.bg: edges around common subjects are clean and sharp. While international benchmarks may have a slight edge in extremely complex edges (such as messy hair or translucent gauze), the resolution available for download on the free tier is significantly more generous, which is the decisive factor in its global reputation battle.
Post-removal companion features include changing background colors for ID photos (red, white, blue), replacing backgrounds, and batch uniform processing—forming a complete closed loop for two high-frequency scenarios: e-commerce and ID photos.
Image Quality Restoration and Portrait Enhancement
Clarifying blurry photos, noise reduction, and enhancing facial details. The restoration of old photos is the feature most frequently recommended by users organically; feedback like "making grandpa's old photo clear again" serves as its best advertisement.
Super-Resolution Upscaling
AI super-resolution at 2x/4x magnification saves small images into large ones suitable for printing or use as main product images, serving as a standard emergency measure for low-resolution assets.
Watermark and Object Removal
Useapply (brush) to remove marks and clutter from images. Copyright boundaries are clearly stated: using the tool on your own images or authorized content is legitimate; removing copyright watermarks from others' works for use constitutes infringement, and the tool does not bear responsibility for this.
Compression, Conversion, and Batch Processing
Lossless compression, mutual conversion between JPG/PNG/WebP/HEIC (a daily lifesaver for iPhone's HEIC compatibility issues), and multi-image batch pipelines—all "peripheral chores" of image processing are consolidated here. These seemingly insignificant features are precisely the adhesive that retains users.
Old Photo Colorization
AI colorization of black-and-white photos, combined with restoration functions to form a complete "old photo rescue kit."
Comparison with Similar Tools
vs remove.bg: The benchmark for single-item precision, still slightly superior in extreme edges with a mature API ecosystem; however, its free tier output resolution is strict and paid plans are expensive. Zuotang wins on comprehensive cost-effectiveness with near-identical quality, a generous free policy, and multi-feature integration—for budget-conscious individuals and small-to-medium sellers, the choice is clear.
vs International PicWish: Two entry points for the same product with identical features; use Zuotang domestically (fast, stable, RMB) and PicWish for overseas business or English workflows. Choose based on your ecosystem.
vs Meitu Design Studio / Gaoding Design: These two follow an "image processing + design templates" e-commerce design platform route with a richer template ecosystem. Zuotang is a purer image processing toolbox, unbound by design narratives. Choose the platform for finished designs; choose Zuotang for processing tools.
vs BgSub: BgSub's local processing (images are not uploaded) is its unique privacy card; Zuotang processes in the cloud but offers functions several times broader. Choose the former for privacy priority, the latter for functionality priority.
vs Photoshop: The unchanging reference point—the upper limit of fine retouching belongs to PS. Zuotang serves the "95% of scenarios where users don't want to learn PS." Thirty-second tasks are not worth opening professional software.
Who is Zuotang For?
E-commerce Sellers and Operators: The daily pipeline of white-background images, batch matting, and compressed uploads makes Zuotang's batch capabilities and free policy a tangible cost advantage for small-to-medium sellers—its core user base.
High-Frequency Needs of Ordinary Users: Changing ID photo backgrounds, restoring and colorizing old photos, converting HEIC formats—each is a real-life moment, all captured by a single bookmark.
Self-Media Creators: A one-stop exit for lightweight needs such as image matting for illustrations, compression to fit platform limits, and format chores.
Assistive Workflows for Designers: Quick background removal and format pre-processing for assets, freeing up PS time for true fine retouching.
Usage Advice
Original image quality determines the AI's upper limit: images with clear contrast between subject and background yield nearly perfect matting results. Prioritize good photography first; do not expect AI to fix everything in reverse order.
For complex edges (hair, cutouts, semi-transparency), inspect the result after processing by zooming in. Use manual repair tools for a few strokes or import into PS for secondary processing if necessary—the one-time AI result is not the end point.
For batch tasks, verify the effect on a single image before running the full batch. Before high-frequency commercial use, calculate the costs by placing free quotas, subscription prices, and your actual processing volume side by side.
Pricing
The free tier offers a highly practical quota and resolution (the foundation of its reputation); paid memberships unlock high-definition batch downloads and higher processing limits; the API is usage-based for developers. Refer to the official website for specifics.
Zaotang’s story serves as a reminder for domestic software tools: if you refine a single feature to a level that can compete in the international market, and pair it with genuine generosity toward free users, word of mouth will spread on its own. If your work or life ever has a moment where you think, “I need to tweak this image”—and chances are, it does—this globally tested toolkit deserves a spot in your browser’s bookmarks bar.