How many backend keywords can I use on Amazon?

There is no word count, only a size limit. Most 2026 seller guides put the US Search Terms field at 249 bytes, which is roughly 200 to 240 characters of plain English with spaces. Check the limit your Seller Central listing editor shows, since it can vary by marketplace.

Do backend keywords still work on Amazon?

Yes. Amazon indexes the Search Terms field even though shoppers never see it. It is most useful for synonyms, misspellings and alternate names. Backend terms help a listing appear for a search, but ranking well still depends on sales, conversion and the rest of the listing.

Should I use commas in Amazon backend keywords?

No. Separate words with spaces. Commas and other punctuation use bytes without improving indexing, and Amazon combines individual words in the field into phrases on its own, so you do not need to write full phrases or repeat words in different orders.

Can I put competitor brand names in backend keywords?

No. Using other brands' names or ASINs in search terms goes against Amazon's listing rules and can put your listing at risk. If you want to appear for competitor searches, use Sponsored Products product targeting or keyword targeting in ads instead.

How do I check if my backend keywords are indexed?

Search Amazon for your ASIN together with the keyword, for example the ASIN followed by a backend word. If your product appears, it is indexed for that term. If not, check that the field is under the byte limit and that the edit has finished processing.

Amazon Backend Keywords: 2026 Rules, Limits and Examples

What changed: Hidden Generic Keyword field, also called Search Terms, indexed by Amazon search
When: Updated October 2026
Who it affects: Anyone who creates or edits Amazon listings
What to do: Keep it under the byte limit and free of repeats and competitor brands

Key takeaways

Backend keywords are hidden but indexed; most guides put the US limit at 249 bytes.
Use them for synonyms, variants and use cases, never competitor brands or repeats.
With 75-character titles in 2026, split keywords across title, Item Highlights, bullets and backend.

Backend keyword checklist

Under the byte limit in your editor
Spaces only, no commas
No words already in title or bullets
Synonyms and alternate names
Real misspellings and Spanish terms
No competitor brands or ASINs
No best, new or sale claims

What are Amazon backend keywords?

Backend keywords live in the Search Terms field, shown in listing templates as Generic Keyword. They tell Amazon about words shoppers might use that your visible copy does not include: synonyms, alternate names, spelling variants, Spanish terms and use cases. They do not appear on the product page, so they can be functional rather than readable.

They are one input among several. Amazon also indexes the title, the new Item Highlights field, bullets, the description and structured attributes. Backend terms work best as the place for words that would make visible copy clumsy.

What is the backend keyword limit on Amazon?

Seller guides for 2026 consistently put the US limit at 249 bytes. The limit is in bytes, not characters. Standard letters, numbers and spaces use one byte each, but accented letters and symbols can use two or more, so a field with Spanish or special characters fills up faster.

Sources disagree on what happens when you go over: some say the field is truncated, others say none of it is indexed. Do not test it. Check the field limit shown in your own Seller Central listing editor, because limits can differ by marketplace and category, and stay under it.

US limit in most seller guides: 249 bytes
Bytes, not characters: accents and symbols cost more
Over the limit risks the field not being indexed
Check the limit shown in your own listing editor

What to include in backend search terms

Use the field for real shopper language your visible copy cannot carry gracefully. The best source is your own data: Sponsored Products search term reports and Brand Analytics show the words people typed before they bought. Our Amazon keyword research guide covers how to build that list.

Synonyms: sofa, couch, settee
Alternate names and abbreviations
Common misspellings people actually search
Spanish terms for the US store where relevant
Use cases and occasions: camping, gift, dorm
Audience words: toddler, senior, men

	Include	Leave out
Synonyms
Use cases
Misspellings
Competitor brands
Title words again

Check the byte count before saving.

What to leave out

Some content wastes bytes, and some breaks Amazon's rules. Competitor brand names are the most serious mistake, because using another brand's name to attract its shoppers can put your listing at risk.

Words already in your title, Item Highlights or bullets
Competitor brand names and ASINs
Your own brand name, which is indexed elsewhere
Subjective claims such as best, cheapest or amazing
Temporary terms such as new, on sale or available now
Offensive or abusive words
Commas, semicolons and repeated words

How to format Amazon backend keywords

Separate words with single spaces. Punctuation does not help and uses bytes. You do not need to repeat words in different orders, because Amazon combines words in the field into phrases. In general, list each word once, use singular or plural rather than both where Amazon matches them, and put the most important words first in case anything is cut off.

A compact example for a stainless steel water bottle whose title already says insulated water bottle 32 oz: flask canteen thermos jug botella de agua gym hiking school kids leakproof cold hot coffee tea. Every word is new information.

Backend keywords after the 2026 title change

Amazon cut titles to 75 characters, including spaces, for all categories except media, with enforcement from July 27, 2026, and added a searchable Item Highlights field of up to 125 characters. Many sellers lost keywords from their titles. Move the most important ones into Item Highlights, put supporting phrases in bullets, and use the backend field for synonyms and variants. Our Amazon product title optimization guide covers the new title rules.

How to add backend keywords in Seller Central, step by step

The field sits in the listing editor in Seller Central.

Go to Catalog, then Manage All Inventory, and open Edit on the product
Open the Keywords or Product Details tab, depending on your layout
Find the Search Terms (Generic Keyword) field
Paste your space-separated words and check the byte count
Save and wait for the change to process
Search Amazon for your ASIN plus a new keyword to confirm indexing

1Open the listing
Manage All Inventory, then Edit
2Find Search Terms
Keywords or Product Details tab
3Paste and count
Stay under the byte limit
4Test indexing
Search ASIN plus keyword

Are Platinum, subject matter and other keyword fields still useful?

Listing templates show other keyword-like fields. Platinum Keywords belonged to a retired seller programme and are widely reported to do nothing for search; see our Amazon platinum keywords guide. Fields such as intended use, target audience and subject matter are attributes that can feed filters and browse pages, so fill them accurately where your category shows them.

Where PPC Spider helps

PPC Spider's Amazon SEO services build backend terms from your actual search term and Brand Analytics data, check byte counts, and re-test indexing after each change. SpiderOS tracks search terms from your ads so new converting phrases make it into the listing. Book a free Amazon audit to see which keywords you are not indexed for.

Sources

SellerSprite: Amazon backend search terms, the 2026 complete checklist (sellersprite.com/en/blog/Amazon-Backend-Search-Terms-The-2026-Complete-Checklist)
PPC Land: Amazon cuts product title limit to 75 characters on July 27 (ppc.land/amazon-cuts-product-title-limit-to-75-characters-on-july-27/)
Amazon Seller Forums: Amazon keyword optimisation practical guide (sellercentral-europe.amazon.com/seller-forums/discussions/t/a15b6c4b-6541-4530-af4f-45bac3a68492)

Want this done for your account?

We run these playbooks on client accounts every day. Start with a free audit.

Get a free audit