What are bleed margins and why are they needed?

Many users confuse the concepts "margins" and "bleed", and even use the incorrect term "bleed margins".
In reality, these are two distinct and essential areas for your printing to come out perfect:

• Bleed: extra space outward from the design
• Inner margin: safety area inward

In this article you will learn the difference and why both are necessary.

What is bleed?

Bleed (also called bleed) is an extra area that is added around the design to avoid white edges when the paper is cut.

✔ Recommended bleed at our print shop:

3 mm per side

This means your file should measure:

• Final size
  • 3 mm top
  • 3 mm bottom
  • 3 mm left
  • 3 mm right

🟦 Example:

A Half Legal book (17 × 21.5 cm):

➡ Final file with bleed: 17.6 × 22.1 cm

What are inner margins?

Margins are the safety space inside the design where text or any important element should remain.

✔ Recommended margin at our print shop:

7 mm minimum inward

This prevents:

• Text from being too close to the edge
• Accidental cutting
• Poor centering after cutting and binding

Diagram to understand bleed and margin

Here's a clear representation:

┌──────────────────────────────────────────┐
│      ← Bleed area (3 mm) →               │
│  ┌────────────────────────────────────┐  │
│  │   ← Inner margin (7 mm) →          │  │
│  │                                    │  │
│  │      SAFE DESIGN AREA              │  │
│  │     (text, important photos)       │  │
│  │                                    │  │
│  └────────────────────────────────────┘  │
└──────────────────────────────────────────┘

Interpretation:

• Outer frame: 3 mm bleed
• Inner frame: 7 mm margin
• Center: safe zone

Why is bleed needed?

Because cutting guillotines have minimum tolerances.
Without bleed, unsightly white edges may appear.

Bleed allows:

• Continuous background without cuts
• Colors to the edge
• Professional art

Why is inner margin needed?

Because during cutting and binding:

• Sheets shift slightly
• The gluing or stapling takes up internal space
• If text is too close to the edge, it can be cut or look bad

With 7 mm we guarantee that the content remains legible, clean, and well centered.

Bleed vs margin — Quick difference

Is bleed also used on covers with spine?

Yes.

A complete cover must include:

• 3 mm bleed
• Correct spine
• Inner safety margin

Check out:
👉 How should I prepare my cover for printing?

And for spine calculation:
👉 How many pages should my file have to match the spine?

How to configure bleed and margins in my files?

You can check the complete guide:
👉 How to prepare my PDF to print correctly?

And also the general guide:
👉 How should my files be configured for printing?

Conclusion

"Bleed margins" don't exist as such; these are two different but complementary concepts:

• Bleed (3 mm): outward
• Margin (7 mm): inward

Both are indispensable for professional printing without errors, white edges, or cut text.