Skip to main content
Editing a design in Mailr is instruction-based: you describe the change in words, optionally attach a reference image or two, and Mailr renders a new version of that side. It isn’t a drag-and-drop canvas and there are no layers to move — you direct the design, you don’t push boxes around. Open the editor from your design library, or with Open in editor → right after a design generates.

​
What’s on the editor screen

  • Editor bar (top) — ← Designs, the design name, a Saved (or Approved) chip, Print preview, Edit from this version, and Approve for use · Front v2 · Back v1 →.
  • Left rail — the Front/Back switcher with live thumbnails (each labeled ”· v3” or “Rendering v4…”), then VERSIONS · FRONT/BACK: every version as a thumbnail, the live one badged Current, and a Use this version action on any other.
  • Middle — the artboard, with Fit, ◉ Print guides, an ↗ Expand control (or double-click) for full size, and the caption “6 × 9 in · Front · v2 · sample home shown — each recipient sees their own house.” On the front of a Home Render design there’s also a ⌂ Sample home / ▦ Transparent toggle.
  • Right — the ACTIVITY thread: your instructions as chat bubbles and each render’s result as a version card (“v3 of the front is ready”, with View and Use this version), with the composer at the bottom.
The house in the editor is always a stand-in. The toggle’s tooltip says it: “The house is a stand-in — every recipient’s card features their own home.” Switch to ▦ Transparent to see your artwork with the photo area knocked out, so you can tell exactly which part of the card each recipient’s home fills.

​
Run an edit

1

Pick the side

Use the Front/Back switcher in the left rail. The composer header changes to EDIT THE FRONT or EDIT THE BACK.
2

Describe the change

Type it in the composer — the placeholder reads “Describe the change to the front…”. Send it empty and you’ll get “Describe the change first.”
3

Attach references (optional)

＋ Add reference opens your brand-kit photos and logos with an upload option, and you can paste an image from your clipboard anywhere in the panel. The cap is 2 reference images per edit — the counter reads “1 / 2”, and going over shows “Up to 2 reference images per edit.” References have to come from your brand gallery or your own uploads.
4

Run it

Press Edit front or Edit back. The fine print spells out exactly what will happen: “This creates v4 for the front. The back will not change. · N credits.”
5

Wait for the new version

The thread shows “Rendering v4 of the front…”, with your queue position if it’s waiting. A toast reads “New version ready” when it lands.

​
One side at a time

An edit only ever changes the side you ran it on. Editing the front never touches the back, and each side runs one edit at a time — start a second front run and you’ll see “A front run is already in progress for this design.” You can work on both sides at once. The app tells you so: “The front is still rendering — you can edit the back at the same time.” Two other limits worth knowing:
  • Nothing to edit before generating — “No front version to edit yet — generate first.” Generate the design before you try to refine it.
  • Approved designs are locked. The composer and every action are disabled. Use New design from this in the library’s ••• menu to get an editable copy.

​
Versions: nothing is overwritten

Every edit creates a new version. Earlier versions are never replaced, so you can always go back. The VERSIONS · FRONT and VERSIONS · BACK rails list every version as a thumbnail. Click one to look at it, and press Use this version to make it live again. Version cards in the ACTIVITY thread carry the same View and Use this version actions. Your next edit — and your approval — always start from the version marked Current. To change which one that is, select the version you want and use Use this version, or Edit from this version in the editor bar (tooltip: “Make this the version your next edit (and approval) starts from.”). If the version is already live the tooltip reads “Edits already start from this version.”

​
Credits and failed runs

The AI credits chip in the section rail shows your balance, and every action shows its own cost before you commit — · N credits under Edit front. If you’re short, you’ll see “Not enough AI credits — this run needs N and you have M.”
Failed or timed-out runs refund automatically. You are not charged for an edit that didn’t produce a version.
Failures are shown per side, in place, and each message says what to do:

​
Writing an edit instruction that works

  • Change one thing per run. Each edit produces one new version, so a single, clear change is easy to judge and easy to undo. Stack several small edits rather than writing one long list.
  • Be concrete and visual. The kind of language the design brief asks for is the kind that works here: “Confident and architectural. One main image, short headline, generous negative space.” Describe the result you want, not the steps to get there.
  • Say which side you mean — and pick it. Instructions only apply to the side selected in the left rail. “Move the phone number up” run on the front will not touch the back.
  • Use a reference image instead of a paragraph. When you want a particular look, attaching one of your own photos (up to two) says more than a long description.
  • If a run comes back wrong, reword rather than repeat. The app’s own advice for a rejected instruction is “Try rewording your direction.”
  • Big changes belong in a regenerate. If you don’t like anything about the result, go back to your brief and use ↺ Generate again rather than fighting it one edit at a time.
Your phone number, website, logo, and colors come from your brand kit and are applied automatically. If a contact detail is wrong on the card, fix it in the brand kit and regenerate — asking for it in an edit instruction is the long way round.

​
Next steps

Create a design

The full flow, including the approval checklist.

What varies per recipient

Which parts of a card change household to household.