How a cover brief is built
A cover brief is not a mood board. It is a one-page contract between the author and the designer that says what the book is, what the file must be, and what shelf it must win. The tool builds that contract from seven inputs you control: the title and author as they will appear on the cover, the genre where the book must be recognized, the trim the interior will actually be printed at, the finished page count, the paper stock that sets the spine, and the mood the cover should carry.
The tool calculates the spine width as pages times PPI for the chosen stock, then the full wrap width and height with 0.125 inches of bleed on all edges, and the safe zone inside the trim. Those four numbers are the production truth the designer must build to, regardless of taste. The genre and mood supply the direction: warm pinks for romance at cozy, deep navy with a single warm accent for thriller at dark, forest and aged gold for fantasy at epic, warm paper for memoir at elegant. The title and author supply the content: the exact strings that will be set, not placeholders. The brief that comes out is a single paragraph plus a spec table, sized so it can be sent as one page.
The brief is complete when a designer who has never read the book can build the correct file without asking a follow-up. If the brief leaves trim blank, the designer will assume 6×9 and you will pay for the revision when the interior is 5.5×8.5. If the brief leaves paper stock blank, the designer will assume white 50lb and the spine will be off by 0.074 inches on cream. The tool does not invent trim or stock; it requires them, because the spine cannot be calculated without them.
Why one page is the right size
One page is not an arbitrary limit. It is the size a designer will actually read before opening the design file. A two-page brief is often skimmed; a three-page deck is often filed. The one-page brief that the tool produces is designed to be read in under two minutes and to answer the only questions that block the file from being built: what is the book, what are the numbers, what is the direction, and what does done look like.
The numbers are the trim, spine, wrap, and safe zone with provenance. The direction is the genre and mood with palette and pairing notes. The done is the deliverables list: front, spine, back, 3D mockup, thumbnail check, and square audio. The one-page constraint forces each of those to be a single line, not a paragraph, which is why the brief is scannable. The designer who receives a scannable brief starts the file; the designer who receives a deck starts by scheduling a call to clarify the deck.
The brief also serves as a record. When the book is reprinted, when the interior grows, or when the next book in the series is briefed, the recorded brief is the comparison point. The new page count times PPI can be compared to the recorded spine width rather than to memory. The recorded trim can be compared to the new trim. The recorded palette and pairing can be compared to the new palette and pairing. The record is what makes the next brief faster and the system more consistent.
What the designer actually needs
The designer needs the cover, not the interior. That distinction saves a category of rework where the interior is sent and the cover is designed from plot.
The designer needs the title and author exactly as they will appear on the cover, including capitalization and punctuation. "The Night Orchard" is not "The Night Orchard: A Novel" for the purpose of the cover. The subtitle lives on the front and spine only if it will actually be on the cover; if the subtitle is metadata only, the cover title is the shorter version and the brief should say so.
The designer needs the trim, page count, paper stock, and binding. Those four set spine width, full wrap, and safe zone. The designer needs the genre and mood to choose palette and pairing, and three comps at thumbnail size that sit together in a grid. The comps are not for copying. They are the shelf the new cover must sit with. The new cover should sit with them, not stand out.
The designer needs the back-cover blurb, not the manuscript. The blurb is the 600 to 1200 characters that live inside the safe zone on the back panel, above the barcode. Placeholder lorem guarantees a reflow after the interior proof. The designer also needs the barcode panel location and the spine text as it will appear: title, author, publisher mark, and series line if the book is part of a series.
The designer needs the deliverables list: the front panel at trim, the spine centered, the back panel with barcode and blurb inside safe, the full wrap at 300 dots per inch with bleed, a 3D mockup, a 160-pixel thumbnail check, and a square 3000 by 3000 audio cover derived from the same layered master. When those deliverables are listed in the brief, the file that arrives is the file that can be uploaded.
Trim, spine, bleed, and safe zone in one view
Every cover needs four numbers, and the brief gives all four with provenance so the designer can verify.
Spine width in inches and millimeters is the thickness of the text block as built from pages and stock. White 50lb is 0.002252 inches per page, cream 50lb is 0.002500, white 60lb is also about 0.002500, white 70lb is about 0.002800. A 300-page book on white 50lb is 0.676 inches, or 17.16 mm. The same 300 pages on cream is 0.750 inches, or 19.05 mm. The difference is the stock, not the trim.
Full wrap width and height is the single spread size the designer will export. It is back width plus spine plus front width plus 0.25 inches for both bleeds on the width, and trim height plus 0.25 inches for top and bottom bleed on the height. A 6×9 with a 0.676 spine is 12.926 by 9.25 inches, which is 328.32 by 234.95 mm. The numbers should match the export to 0.01 inches or 0.25 mm.
Safe zone inside the trim is the text-safe rectangle where type must live. On a 6×9 paperback it is 5.50 by 8.50 inches, inset 0.25 from the trim on every side. On a hardcover jacket the inset is roughly 0.50, so the safe zone is about 5.00 by 8.00 even though the trim is the same. Type that drifts outside may survive a soft proof, but a 0.05-inch trim shift on press will push it to the edge.
Bleed and safe insets are fixed per binding in the KDP world — paperback bleed 0.125 with 0.25 safe, jacket bleed 0.125 with 0.50 safe. Do not invent other insets; those are the constants the breakdown uses, so a spread built from them will match what the printer expects. The comparison table in the output keeps the same spine across trims while the wrap changes, because thickness does not know panel size.
Palette, fonts, and mood as direction, not decoration
The brief's direction is two sentences, not a mood board. The genre and mood you selected supply the palette and pairing notes that the designer will use.
Palette direction comes from the genre palette tool: warm pinks and creams with a deep plum anchor for romance at cozy, deep navy-charcoal with a single warm accent for thriller at dark, forest and aged gold for fantasy at epic, warm paper for memoir at elegant. The brief repeats the genre note — thriller dark is deep navy-charcoal field with a single warm accent and high-contrast type, tense and cinematic — so the designer sees the family without opening another tool.
Font direction comes from the pairing picker: thriller short titles can carry Bebas Neue Bold with Inter Regular, long titles need Anton Regular with Inter Medium; romance short can carry Cormorant Garamond Bold with Montserrat, long needs Libre Baskerville Bold with Inter. The brief does not prescribe the exact point size, because size depends on the title length and the trim, but it names the families so the choice is constrained to the genre-correct pairing for the bucket.
Mood shifts the same genre without breaking it. Thriller at dark is midnight; thriller at bright is overcast daylight; thriller at tense pushes contrast harder. The brief names the mood you selected so the designer knows whether to grade the image darker or lighter, more saturated or more muted, while keeping the genre family. The same thriller base at dark and at bright are still thriller, but the image grade is different.
Worked examples with the brief as it will be sent
Note: the following examples are hypothetical and illustrative rather than a sourced case study.
A thriller at 6×9, 300 pages, white 50lb, dark mood is the standard trade thriller. Title The Night Orchard, author Jane Doe. The dims are 6.00 by 9.00, spine 300 times 0.002252 equals 0.676 inches, wrap 12.926 by 9.25 inches with 0.125 bleed, safe 5.50 by 8.50. The direction is thriller dark — deep navy-charcoal field with a single warm accent and high-contrast type, tense and cinematic, deepened 18% moodier. The deliverables are front, spine centered, back with blurb inside safe, 3D mockup, 160px thumbnail, and square 3000×3000 audio cover. The brief that comes out is seven lines: project line with title, author, genre and mood; trim line with dims, pages, stock and PPI; spine line with inches and millimeters; wrap line with inches and millimeters and bleed; safe line with dimensions; direction line with genre note and mood; deliverables line with front/spine/back/mocks; and references line asking for three comps at thumbnail that sit together. The character count is around 750 to 850, well inside the 600 to 1200 band for the brief itself, and the verdict is brief ready to send.
A memoir at 5.5×8.5, 280 pages, cream 50lb, elegant mood is a lighter brief. Title The Translators, author Maya Chen. Trim 5.50 by 8.50, pages 280, stock cream 50lb at 0.002500, spine 280 times 0.002500 equals 0.700 inches, wrap 5.50 plus 0.700 plus 5.50 plus 0.25 equals 11.950 by 8.75 inches, safe 5.00 by 8.00 with the larger jacket inset. Direction is memoir elegant — warm paper and stone with soft brown and charcoal, quiet and credible, lightened and desaturated toward restrained. The same 280 pages on white 50lb would be 0.631 inches, so the spine panel would be 0.069 inches narrower. The brief makes that stock choice explicit so the designer does not assume white.
A business book at 6×9, 240 pages, white 70lb, bright mood is the heavier-stock case. Title The Operator, author Alex Rivera. Trim 6×9, pages 240, stock white 70lb at 0.002800, spine 240 times 0.002800 equals 0.672 inches, wrap 6.00 plus 0.672 plus 6.00 plus 0.25 equals 12.922 by 9.25, safe 5.50 by 8.50. Direction is business bright — clean white field with deep navy authority, teal and amber accents, confident and legible, lifted fifteen percent airier. The brief notes the heavier stock is chosen for premium feel, not for thickness, and the spine is not being widened for effect.
A brief that is too short shows why title and author matter. Book title empty, author Jane Doe, same 6×9 300 white dark. The brief is generated, but the first line is Project: Cover for Untitled by Jane Doe, and the character count is around 400, below the 500 that signals a complete brief. The verdict is warning — add title and author — because the brief will be generic without them. The fix is not to add more specs; it is to add the two strings that make the brief specific to the book.
Edge cases: no trim yet, no page count yet, series, and square
No trim yet is the most common before the interior is final. The brief requires trim, so pick the most likely and mark it as provisional. For fiction, 6×9 on white 50lb is the default; for memoir, 5.5×8.5 on cream is common; for workbook, 7×10 or 8.5×11. Note that the spine will be recalculated when the interior is final. Do not leave trim blank; the designer will assume one and you will pay for the revision when the interior is 5.5×8.5 and the cover was built for 6×9.
No page count yet is similar. Use an estimate at 275 words per page for a 6×9, round up, and note that the spine is estimated. A 75,000-word manuscript at 275 per page is 273 pages; a 90,000-word manuscript is 328. The estimate is good enough to start the cover, but the final spine must be recalculated from the typeset page count before the cover is approved. The brief's page count line is the place to mark estimated versus final.
Series covers test the brief's system. The brief for Book Two should be the same trim, stock, palette dominance, font pairing, grid, and spine system as Book One, with only the title, art, and number changed. If the brief for Book Two introduces a new palette or a new grid, the series will drift. The series cover consistency checker flags that drift, but the brief is where it is prevented. Lock the system in the brief and hand the previous cover to the designer with the brief, not just the brief alone.
Square audio covers are not portrait eBook covers. The brief lists the square 3000×3000 audio cover as a deliverable derived from the same layered master, not as a stretched portrait. The audio square needs its own title setting for the square, with type inside a 10% inset from the edge. Keep the square in the brief so the designer delivers it, even when the audio edition is months away. The layered master at 4000 to 6000 on the long side makes both the portrait and the square sharp with a light sharpen after downscaling.
How to use the brief in under two minutes
Enter the book as the designer will see it. Title and author exactly as they will appear on the cover, including capitalization. If the subtitle will appear on the cover, include it in the title string as it will be set; if the subtitle is metadata only, the cover title is the shorter version and the brief should say so.
Pick the production specs you will actually print. Genre, mood, trim, page count, and paper stock. If page count is estimated, note that and recalculate when the interior is final. If you are undecided between 5.5×8.5 and 6×9, generate both briefs and compare the wrap widths; the two-inch difference is all front and back area plus bleed, not spine.
Generate the one-page brief. The tool calculates spine, wrap, safe zone, and adds the genre direction. Copy the paragraph that comes out — it is already formatted as seven lines, each with a label and a value — and paste it into an email or a brief doc. Add three comps at thumbnail size that sit together in a grid. The new cover should sit with them, not stand out. Attach the layered master or the previous book's cover as reference.
Send and lock. The one-page brief that is sent is the one that will be built. Any change to trim, spine, or palette after approval is a new brief, not a tweak. Keep a copy of the sent brief alongside the KDP file name. When the book grows, compare new numbers to the logged ones rather than trusting memory that the file is now longer. The arithmetic is fixed; your file is the variable.
Common mistakes and how to avoid them
Sending a mood board instead of a brief is the most common. A mood board is inspiration; a brief is a contract. The designer can be inspired by the board after the contract is clear, but the contract must come first. The tool's seven-line brief is the contract.
Leaving trim or stock blank is the second. The spine cannot be calculated without them, and the wrap cannot be calculated without trim. The designer will assume the most common — 6×9 on white 50lb — and the assumption will be wrong for the interior you actually have. Pick the most likely, mark it provisional if needed, and recalculate when final.
Including the manuscript is the third. The designer needs the cover, not the interior. The manuscript invites design from plot rather than from shelf. Title, author, subtitle, series line, and back-cover blurb are the text the designer needs.
Writing a three-page brief is the fourth. A brief that is three pages will not be read. The seven-line brief with a spec table, two sentences of direction, and three thumbnails is the one that gets built. Link the full brand guide if it exists; do not paste it.
Not specifying the deliverables is the fifth. The file that arrives as a flat front panel only is not a wrap, and the file that arrives without a square audio cover will require a second commission. List the deliverables in the brief: front, spine, back with barcode and blurb inside safe, 3D mockup, thumbnail check, and square audio.
Forgetting the back-cover blurb is the sixth. The blurb must be final before the back is set, because the blurb lives inside the safe zone. Placeholder text guarantees a reflow after upload. Write the blurb in three sentences — hook, stakes, and credentials — at 600 to 1200 characters, and include it in the brief.
Changing the brief after art is approved is the seventh. Trim, spine, and palette are the expensive changes. Brief lock before art starts, and treat any change to those after approval as a new brief with a new timeline.
Final checks before you send
Run the generator twice: once with the specs you intend to ship and once with a variant where trim is one step larger or where stock is one step heavier. If the variant's wrap width is still within the same ballpark and the spine text still sits comfortably inside the panel with quiet on both sides of the hinge, the choice is resilient. If the variant pushes text toward the hinge or off the spine, you know which variable is the weak link.
Open the brief and read it as the designer will. Does the title and author match the cover exactly? Does the trim match the interior you will upload? Does the page count match the typeset file? Does the paper stock match what you will order? Does the genre direction name the shelf the book must win, and does the mood match the interior tone? If any line is vague, rewrite that line before sending. The brief is the place to be precise; the art is the place to be expressive.
Check the safe-zone inset. The brief lists the safe zone as trim minus 0.50 in each dimension. Keep all type inside that rectangle, not just inside the trim. A title that sits 0.15 inches from the trim at full size is inside the trim but outside the safe zone, and a slight trim variance will push it into the margin.
Upload and verify live after the cover is built. In the KDP previewer, check the print-proof PDF's spine between the hinge lines at 200% zoom and the full wrap at 100%. The spine text should be centered with equal quiet on each side, and the wrap should be the exact inches the brief reported. On a phone listing in an incognito window, confirm the front title reads at thumbnail. If the front reads and the back fits with air around the blurb above the barcode, lock the brief and record it alongside the KDP file name. When the next book in the series is briefed, reuse the same structure — trim, stock, palette, fonts, grid, spine — and let the art be the variable. The system is the variable that compounds; the art is the variable that varies.