A mockup is rarely finished forever after one editing session. Artwork changes, new colorways appear, a customer requests another view, or the project moves to a specialist working in Photoshop or Procreate. File handling is therefore part of the creative workflow, not an administrative afterthought. Mockup Paint supports its own editable project format, common raster and vector files, PSD exchange, and even HTML/CSS as a visual source.
This guide explains what each format is for, what information can be preserved, and how to hand off a project without reducing it to a single flattened preview.
Separate project, exchange, and delivery files
Files generally serve one of three roles. A project file preserves the editable working state. An exchange file carries content into another application. A delivery file is intended for publishing, approval, or production.
One format rarely performs all three roles perfectly. A JPEG is easy to preview but contains no editable layer structure. A PSD can carry layers, yet application-specific effects may not translate exactly. A print PDF communicates production dimensions and color intent but is not the ideal source for future design changes.
A reliable project keeps at least one editable master plus the required exchange and delivery outputs.
Save the editable state as .mockuppaint
Mockup Paint uses the .mockuppaint extension for its native project files. The current structured format includes a version identifier and preserves far more than a flat image.
Project data can include:
- canvas elements and positions
- layers and groups
- image data
- masks and cutouts
- four-corner perspective information
- document and DPI settings
- guide groups
- project name
- a visual thumbnail
This is the correct file to save when work will continue in Mockup Paint. Text, masks, placement, and other components remain available for revision.
Save important milestones rather than relying on one repeatedly overwritten file. A version before complex masking or a major design replacement can provide a useful recovery point.
Use clear file names and versions
An effective file name identifies the collection, product, view, variant, and version. For example:
autumn-hoodie-back-black-v03.mockuppaint
This is easier to understand than “new final latest 2.” Use sequential version numbers for meaningful changes. When a file has been approved, mark that status in accompanying documentation or a controlled naming convention rather than deleting earlier working versions immediately.
The project thumbnail helps identify a file visually. Save while a representative canvas view is visible so similar variants are easier to distinguish.
Import PSD files into Mockup Paint
PSD is Adobe Photoshop’s native document format and is supported by several creative applications. Mockup Paint can import PSD files while retaining important structure such as layer names, opacity, groups, hidden states, and supported blend modes.
This makes PSD a practical bridge for existing artwork. A layered composition prepared in Photoshop can move into Mockup Paint for product placement, masking, perspective work, or browser-based export.
RGB PSD files with clear, conventional layers offer the most reliable editable route. Very advanced Photoshop features, including particular adjustment layers, smart objects, filters, or application-specific effects, may not have direct equivalents. The importer may simplify unsupported content or rely on composite appearance where necessary.
After import, compare the document with a trusted reference image. Check layer order, text appearance, opacity, blend modes, masks, and color.
Understand the limits of CMYK PSD import
CMYK documents are common in print production, but they are harder to represent as fully editable browser content. Mockup Paint may not expose every CMYK PSD layer as an editable equivalent, and a composite fallback can be used.
If editing flexibility is the priority, create an RGB working copy of the PSD while preserving the original CMYK master separately. Complete visual work in the RGB-compatible workflow, then use the intended print-output process or production application for final color handling.
Never discard the original file during conversion. An exchange limitation should not become a loss of source data.
Export PSD for Photoshop or Procreate
Mockup Paint can export PSD as well. This is useful when a browser-created composition needs detailed retouching, painting, or further layout in Photoshop or Procreate.
Clean the layer panel before export. Rename important elements, create logical groups, remove genuinely obsolete experiments, and distinguish hidden alternatives from approved content. A recipient should be able to understand the file without guessing what “Layer 18 copy” contains.
Cross-application testing is essential. Open the PSD in the intended destination and inspect visual fidelity. Fonts, masks, blend modes, and special effects can behave differently across tools. Include a PNG reference of the approved appearance so any difference is immediately visible.
Use PNG and JPEG for universal previews
PNG and JPEG are the easiest formats for approvals and digital publishing. PNG provides lossless raster output and supports transparency. It is suitable for isolated logos, cutouts, high-quality store images, and visual references.
JPEG produces smaller files and works well for photographic compositions with a full background. Mockup Paint provides selectable quality settings, including levels such as 60, 80, and 100 percent. Lower quality may be adequate for a quick review; final assets should be checked for blockiness, halos, and damaged text edges.
Both formats usually flatten the visible composition. They should accompany, not replace, the editable project master.
Import and export SVG paths
SVG is intended for vector content. Mockup Paint can import SVG files as paths, allowing their shapes to participate in the canvas and layer workflow. It can also export vector paths as SVG.
This is valuable for logos, icons, lettering, badges, and flat illustrations. Vector paths scale without the same pixel limitations as raster images. However, SVG files can include embedded bitmap images, filters, masks, font dependencies, and tool-specific metadata. Not every feature transfers identically.
After importing an SVG, inspect fills, strokes, transparency, scale, and grouping. Before exporting one, remove unwanted hidden paths and confirm the intended bounds. Open the result in its destination application as a final test.
Import common image sources
PNG and JPG images can be brought onto the canvas as normal elements. Multiple logos or artwork files can remain available in a session, making it faster to compare product variants.
Imported images can be cropped, trimmed, isolated, masked, upscaled, color-adjusted, and warped in four-corner perspective. Their source resolution still sets a quality ceiling. A small web image should not become the master for a large print file merely because the editor can scale it.
Maintain a separate folder of original assets. The project file preserves the working state, but a clear source archive remains valuable for long-term brand management.
Turn HTML and CSS into a canvas image
Mockup Paint can accept HTML and CSS content directly or load it from a file. The content appears as an embedded preview and can then be rasterized into an image for normal canvas use and export.
This unusual workflow is useful for website sections, interface mockups, code-based cards, and other visuals that already exist as markup. Once converted to an image, the result can be scaled, masked, clipped, or placed in perspective on a device display.
Rasterization preserves the visible appearance, not the original interactivity. Buttons do not remain clickable in the exported product graphic. Also check web fonts and external assets before conversion so the preview contains everything expected.
Organize recurring resources with Brand Kits and Tech Packs
Mockup Paint includes Brand Kit and Tech Pack areas. Brand resources can keep recurring logos, colors, and visual elements consistent. Tech Packs support organized product information and production-oriented communication.
These resources complement project files. The project stores a specific composition; a brand or technical collection provides reusable inputs across many compositions. Teams should establish which assets are approved and avoid maintaining several nearly identical logo versions without clear status.
Build a complete handoff package
When another designer, agent, customer, or production partner receives the work, send enough information to both inspect and continue it. A useful package may contain:
- the
.mockuppaintproject - a PNG or JPEG visual reference
- a PSD or SVG exchange file when needed
- original logos and artwork
- target dimensions and DPI
- export or production notes
- a clear approved-version label
The reference image is particularly important. If the exchange file renders differently elsewhere, it records the intended appearance.
Keep the package focused. Do not send dozens of unexplained drafts when only one master and two approved alternatives are relevant.
Protect browser-based work with local saves
Browser editing does not remove the need for backups. Download .mockuppaint files regularly during important work, especially after detailed masking, perspective setup, or a large layer reorganization.
Save before switching browsers, clearing site data, making major environment changes, or beginning risky experiments. Keep a second copy of important client and production projects on a backed-up drive or appropriate storage service.
The safest workflow assumes that any single session can be interrupted and that the latest meaningful milestone should still be recoverable.
A dependable exchange workflow
- Build and organize the project in Mockup Paint.
- Name layers and groups clearly.
- Save an editable
.mockuppaintmilestone. - Export a PNG reference of the intended appearance.
- Choose PSD or SVG according to the destination.
- Open the exchange file in the receiving application.
- Check color, scale, layers, masks, fonts, and blend modes.
- Package the verified files with concise notes.
Run this test before the deadline, not after the files have already been sent.
Conclusion
Mockup Paint supports an entire file lifecycle. The native project format preserves editability, PSD connects with Photoshop and Procreate, SVG carries suitable vector paths, HTML/CSS provides an additional visual source, and PNG, JPEG, or PDF serve specific delivery needs.
The central rule is simple: a final image is not the same as an editable master. Keeping project, exchange, and delivery files distinct protects creative work and makes collaboration far more predictable.
CTA placeholder: Save the current Mockup Paint project as an editable master, then create and test the exact exchange format needed for the next step.
Troubleshoot a PSD import before handoff
When an imported PSD does not look exactly like the source file, begin with a controlled comparison instead of rebuilding the mockup. Open the original and note which layers, adjustment effects, and smart objects are visible. Create a simplified test copy with complex effects represented as a visible reference layer. This separates an unsupported feature from a layer-order or transparency issue. Also check RGB or CMYK mode, embedded fonts, and the edge of transparent pixels. A dependable handoff contains the editable project, a flattened PNG that records the expected appearance, and the exchange PSD. If the PNG matches, reconstruct only the affected layer rather than repeating the entire composition.
Common mistakes when saving and reopening projects
Most problems do not happen while saving, they happen when the project is reopened. The most common case: the file was edited in another browser or on another device, and the local storage of the second device still holds an older version. Mockup Paint keeps projects in browser storage; anyone working on two machines should export projects as a file before switching devices.
The second common mistake is a failed PSD import with a cryptic error message. Three causes cover almost every case. First, the PSD uses features from other tools, such as complex smart object filters that do not map to Mockup Paint layers. Second, the file exceeds the size the browser handles without warning; reducing the file before import helps. Third, the PSD contains no compatible layers, for example a pure camera raw format. In all three cases, flattening or simplifying the layer structure in Photoshop or Photopea before importing solves it.
Compatibility and limits in daily work
Anyone moving between Mockup Paint and classic desktop tools should know the boundaries. Exporting as PSD exchanges layers, text and simple effects reliably, while complex gradient grids and advanced layer styles are translated into simpler representations. For daily product image work that means mockups, cutouts and layout work travel well between the tools, while specialized print retouching should be prepared directly in the target format. Knowing this boundary keeps failed imports rare and keeps control over which file is the leading version of a project.
Frequently asked questions
Which file is the editable master?
The native Mockup Paint project preserves the working state for future edits. PNG and JPEG are delivery views.
Why can PSD import look different?
Application-specific Photoshop features may not translate identically. Inspect layers, transparency, color mode, and effects afterward.
What belongs in a handoff?
Include the project, a visible reference, and notes about fonts, source artwork, and unresolved decisions.
How should versions be named?
Use the project name, a version number, and a date when useful. Keep master, exchange, and delivery files separate.
Related Mockup Paint guides
- Create AI Product Images with the Mockup Paint Smartboard
- Mockup Paint: A Complete Guide to the Browser-Based Mockup Editor
Sources
- Mockup Paint homepage – official product scope and workflow. (Accessed: 06.09.2026)
- Mockup Paint editor – official editing area and available tools. (Accessed: 06.09.2026)