How to Find KDP Keywords Without a Paid Tool
By SmartKDP
You do not need a subscription to find language that belongs in Amazon KDP’s seven backend keyword boxes. You need a repeatable method: start from the book, expand real Amazon search suggestions, cluster by intent, drop anything already in the title or categories, then fill seven short fields that pass KDP’s rules and the per-box length budget.
This guide is that method — tool-independent on purpose. A spreadsheet and the Amazon search bar are enough. Free accelerators help: the Amazon Keyword Suggestion Expander runs a planned expansion of real suggestions; the KDP Keyword Generator helps package seven boxes under the length limit once you have honest candidates. For what autocomplete is and is not, see How Amazon Search Suggestions Work.
Not affiliated with Amazon. Keyword rules cite public KDP help. Autocomplete is a demand signal, not a published monthly volume for every phrase. Confirm candidates in the live Amazon search box and your KDP account before you publish.
The constraint that bites
Free research still has to obey the same seven boxes and avoid list as paid research.
KDP allows up to seven keywords or short phrases (keyword help). Watch the per-field length limit in the form (SmartKDP tools model 50 UTF-8 bytes per box so multi-byte characters do not overfill). Avoid information already in title/contributors/categories, quality claims, promo language, program names, competitor brands you do not control, quotes, and HTML.
A free method that ignores those rules just produces free mistakes.
seed from the book
→ expand Amazon suggestions
→ cluster by intent
→ dedupe title / subtitle / categories
→ filter KDP avoid list
→ fill 7 boxes under the length budget
→ search-test, then paste
Step 1 — Seed from the book (not from a random hot phrase)
Write 5–10 seed phrases that are true of your interior:
| Seed type | Examples of the shape |
|---|---|
| Format | large print word search, sudoku for adults |
| Audience | seniors, kids ages 8–12, nurses, beginners |
| Theme | travel puzzles, garden themes, holidays |
| Use case | road trip activities, retirement gifts |
| Tone / difficulty | easy word search, hard maze |
If a seed would mislead a buyer who opens the book, delete it. Accuracy is a KDP rule, not a premium feature.
Step 2 — Expand with free Amazon surfaces
For each strong seed:
- Type it into Amazon Books search (marketplace you care about).
- Record the autocomplete suggestions (KDP’s own keyword help tells you to use the Search field drop-down).
- Alphabet-expand lightly: seed + space, seed + a letter, and a few natural modifiers (“for,” “with,” “easy”).
- Open 2–3 result pages and note recurring language in competitor titles and subtitles (not their backend boxes — you cannot see those).
Optional accelerator: the free Amazon Keyword Suggestion Expander fans out prefixes systematically and keeps appearance structure so you are not doing a–z by hand. Treat outputs as candidates, not as secret volume scores (signal vs volume; methodology).
Step 3 — Cluster by intent
Dump every phrase into a sheet. Tag each row with one primary cluster:
- Audience
- Format
- Theme
- Difficulty / use case
- Adjacent but accurate
You want coverage across clusters, not seven near-duplicates of the same idea.
Step 4 — Dedupe against title, subtitle, and categories
Cross out any phrase that only restates:
- Exact title words
- Subtitle already on the cover
- Category labels you already selected
KDP tells you to avoid information already covered in other metadata and words already mentioned in your categories. Free research that ignores this wastes free slots.
Step 5 — Filter the KDP avoid list
Before a phrase earns a box, it must clear the public avoid list (quality claims, time-sensitive promo, program names, brands you do not own, quotes, HTML, pure “book” filler, etc.). Details: KDP Keyword Mistakes and The 7 KDP Backend Keyword Boxes, Explained.
Step 6 — Fill seven boxes within the length budget
Pick one best phrase per remaining intent (or a tight natural cluster that still reads as shopper language). Prefer 2–3 word phrases in natural order. Keep each box under the field’s limit (count bytes if you use accents or non-Latin scripts).
Illustrative shape (not a real listing):
| Box | Phrase | Cluster |
|---|---|---|
| 1 | large print seniors | audience + format |
| 2 | travel word search | theme |
| 3 | holiday word search | theme |
| 4 | easy word search | difficulty |
| 5 | retirement activities | use case |
| 6 | word search answer key | feature |
| 7 | brain games adults | adjacent accurate |
Leave a box empty rather than pad with junk.
Step 7 — Search-test, then paste
For each final phrase:
- Search it on Amazon Books.
- Confirm result quality looks like your book type.
- Paste into KDP → Save and Continue → publish the update.
Optional packaging: when you want seven fields generated under the byte budget from your book facts, use the KDP Keyword Generator — still edit for honesty.
What “free” does and does not buy you
| Free and durable | Not free, not required for step one |
|---|---|
| Amazon search bar + autocomplete | Paid “volume” dashboards |
| Competitor title language | Seeing another author’s backend keywords |
| Spreadsheet clustering | Automated competitor scrape |
| KDP avoid list from help pages | Invented monthly search counts |
Paid tools can speed packaging and analysis. They cannot exempt you from accuracy or the seven-field structure.
FAQ
How do I find KDP keywords for free?
Start from true book seeds, expand with Amazon autocomplete and light prefix tests, cluster by intent, remove title/category clones, filter KDP’s avoid list, then fill up to seven short fields and search-test each one.
Do I need a paid keyword tool for KDP?
No for discovery of shopper language. Amazon’s search suggestions and public listings are free. Paid tools may save time; they are not a substitute for accuracy.
How many keyword boxes does KDP allow?
Up to seven keywords or short phrases per title. Watch each field’s on-screen length limit.
Should I use free “search volume” websites?
Be skeptical of bare monthly integers for Amazon phrases without a verifiable source. Prefer language you can observe in autocomplete and validate in search results. See How Amazon Search Suggestions Work.
Can I copy competitors’ backend keywords?
You cannot see their backend boxes. Copying visible title spam is a good way to inherit their policy problems. Steal structure (what intents they cover), not illegal or misleading strings.
Where do I put leftover phrases that do not fit seven boxes?
Prioritize. Rotate later — KDP allows keyword updates. Description may use natural language, not a tag dump.
What free SmartKDP tools help?
Amazon Keyword Suggestion Expander for expansion; KDP Keyword Generator for seven-box packaging; KDP Listing Checker for a free guideline pass.
Related tools and guides
- Amazon Keyword Suggestion Expander — free expansion of real Amazon suggestions
- KDP Keyword Generator — seven boxes under the length budget
- How Amazon Search Suggestions Work — signal vs volume
- The 7 KDP Backend Keyword Boxes, Explained — field model
- KDP Keyword Mistakes — avoid-list failures
- All free KDP tools
Disclaimer
Amazon, Kindle, KDP, and related marks are trademarks of Amazon.com, Inc. or its affiliates. SmartKDP is not affiliated with, endorsed by, or sponsored by Amazon. Keyword rules and autocomplete behavior change; always re-check live Amazon search and KDP help before you publish.