diff --git a/backend/src/graphql/resolver/ContributionResolver.test.ts b/backend/src/graphql/resolver/ContributionResolver.test.ts
index b584624c2..20f11ff9a 100644
--- a/backend/src/graphql/resolver/ContributionResolver.test.ts
+++ b/backend/src/graphql/resolver/ContributionResolver.test.ts
@@ -66,6 +66,42 @@ describe('ContributionResolver', () => {
       })
 
       describe('input not valid', () => {
+        it('throws error when memo length smaller than 5 chars', async () => {
+          const date = new Date()
+          await expect(
+            mutate({
+              mutation: createContribution,
+              variables: {
+                amount: 100.0,
+                memo: 'Test',
+                creationDate: date.toString(),
+              },
+            }),
+          ).resolves.toEqual(
+            expect.objectContaining({
+              errors: [new GraphQLError('memo text is too short (5 characters minimum)')],
+            }),
+          )
+        })
+
+        it('throws error when memo length greater than 255 chars', async () => {
+          const date = new Date()
+          await expect(
+            mutate({
+              mutation: createContribution,
+              variables: {
+                amount: 100.0,
+                memo: 'Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test',
+                creationDate: date.toString(),
+              },
+            }),
+          ).resolves.toEqual(
+            expect.objectContaining({
+              errors: [new GraphQLError('memo text is too long (255 characters maximum)')],
+            }),
+          )
+        })
+
         it('throws error when creationDate not-valid', async () => {
           await expect(
             mutate({
@@ -313,6 +349,48 @@ describe('ContributionResolver', () => {
         })
       })
 
+      describe('Memo length smaller than 5 chars', () => {
+        it('throws error', async () => {
+          const date = new Date()
+          await expect(
+            mutate({
+              mutation: updateContribution,
+              variables: {
+                contributionId: result.data.createContribution.id,
+                amount: 100.0,
+                memo: 'Test',
+                creationDate: date.toString(),
+              },
+            }),
+          ).resolves.toEqual(
+            expect.objectContaining({
+              errors: [new GraphQLError('memo text is too short (5 characters minimum)')],
+            }),
+          )
+        })
+      })
+
+      describe('Memo length greater than 255 chars', () => {
+        it('throws error', async () => {
+          const date = new Date()
+          await expect(
+            mutate({
+              mutation: updateContribution,
+              variables: {
+                contributionId: result.data.createContribution.id,
+                amount: 100.0,
+                memo: 'Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test',
+                creationDate: date.toString(),
+              },
+            }),
+          ).resolves.toEqual(
+            expect.objectContaining({
+              errors: [new GraphQLError('memo text is too long (255 characters maximum)')],
+            }),
+          )
+        })
+      })
+
       describe('wrong user tries to update the contribution', () => {
         beforeAll(async () => {
           await query({
diff --git a/backend/src/graphql/resolver/ContributionResolver.ts b/backend/src/graphql/resolver/ContributionResolver.ts
index ef4467a71..c6b129b5f 100644
--- a/backend/src/graphql/resolver/ContributionResolver.ts
+++ b/backend/src/graphql/resolver/ContributionResolver.ts
@@ -12,6 +12,9 @@ import { UnconfirmedContribution } from '@model/UnconfirmedContribution'
 import { User } from '@model/User'
 import { validateContribution, getUserCreation, updateCreations } from './util/creations'
 
+const MEMO_MAX_CHARS = 255
+const MEMO_MIN_CHARS = 5
+
 @Resolver()
 export class ContributionResolver {
   @Authorized([RIGHTS.CREATE_CONTRIBUTION])
@@ -20,6 +23,16 @@ export class ContributionResolver {
     @Args() { amount, memo, creationDate }: ContributionArgs,
     @Ctx() context: Context,
   ): Promise<UnconfirmedContribution> {
+    if (memo.length > MEMO_MAX_CHARS) {
+      logger.error(`memo text is too long: memo.length=${memo.length} > (${MEMO_MAX_CHARS}`)
+      throw new Error(`memo text is too long (${MEMO_MAX_CHARS} characters maximum)`)
+    }
+
+    if (memo.length < MEMO_MIN_CHARS) {
+      logger.error(`memo text is too short: memo.length=${memo.length} < (${MEMO_MIN_CHARS}`)
+      throw new Error(`memo text is too short (${MEMO_MIN_CHARS} characters minimum)`)
+    }
+
     const user = getUser(context)
     const creations = await getUserCreation(user.id)
     logger.trace('creations', creations)
@@ -119,6 +132,16 @@ export class ContributionResolver {
     @Args() { amount, memo, creationDate }: ContributionArgs,
     @Ctx() context: Context,
   ): Promise<UnconfirmedContribution> {
+    if (memo.length > MEMO_MAX_CHARS) {
+      logger.error(`memo text is too long: memo.length=${memo.length} > (${MEMO_MAX_CHARS}`)
+      throw new Error(`memo text is too long (${MEMO_MAX_CHARS} characters maximum)`)
+    }
+
+    if (memo.length < MEMO_MIN_CHARS) {
+      logger.error(`memo text is too short: memo.length=${memo.length} < (${MEMO_MIN_CHARS}`)
+      throw new Error(`memo text is too short (${MEMO_MIN_CHARS} characters minimum)`)
+    }
+
     const user = getUser(context)
 
     const contributionToUpdate = await dbContribution.findOne({